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Weisse C, Asano K, Ishigaki K, Lipscomb V, Llanos C, Zwingenberger AL, Carroll KA, Grosso FRV, Stock E, Buote N, Aly A, Murgia D, Arai S, Linden AZ, Gordon J, Manassero M, Schwarz T, Wallace ML, Graham J, Hardie R, Chang Y, Robbins M, Bismuth C, Karnia J, Sterman A, Saunders A, Montinaro V, Guarnera I, McLauchlan G, Černá P, Maurin MP, Aisa J, An A. Anatomical classification of feline congenital extrahepatic portosystemic shunts based on CT angiography: A SVSTS and VIRIES multi-institutional study in 231 cats. Vet Radiol Ultrasound 2024. [PMID: 38597362 DOI: 10.1111/vru.13363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 03/02/2024] [Accepted: 03/17/2024] [Indexed: 04/11/2024] Open
Abstract
The prevalence of anatomical-based subtypes of feline congenital extrahepatic portosystemic shunts (EHPSS) has not been completely elucidated. The goal of this study was to use CT angiography to create an anatomical-based nomenclature system for feline congenital EHPSS. Additionally, subjective portal perfusion scores were generated to determine if intrinsic portal vein development was associated with different shunt conformations or patient age at the time of CT. The SVSTS and VIRIES list services were used to recruit cases. Data collected included patient DOB, gender, breed, weight, CT date, and reported diagnosis. Shunts were classified based upon (1) the shunt portal vessel(s) of origin, (2) the shunt systemic vessel(s) of insertion, and (3) any substantial portal vessels contributing to the shunt. Additionally, hepatic portal perfusion was subjectively scored between 1 (poor/none) and 5 (good/normal) based on the caliber of the intrahepatic PVs. A total of 264 CT scans were submitted from 29 institutions. Due to exclusion criteria, 33 (13%) were removed, leaving 231 CT scans to be included. Twenty-five different EHPSS anatomies were identified with five classifications accounting for 78% of all shunts (LGP [53%], LGC-post [11%], LCG [7%], LGC-pre [4%], and PC [4%]). Shunt origin involved the left gastric vein in 75% of the described classifications. Significant differences were identified among the five most common shunt types with respect to age at the time of CT scan (P = .002), breed (P < .001), and subjective portal perfusion score (P < .001). This refined anatomical classification system for feline EHPSS may enable improved understanding, treatment comparisons, and outcome prediction for cats with these anomalies.
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Affiliation(s)
| | | | | | | | - Cesar Llanos
- Royal Veterinary College, Hatfield Herts, England
| | | | - Kenneth A Carroll
- College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
| | | | | | - Nicole Buote
- Cornell University College of Veterinary Medicine, Ithaca, New York, USA
| | - Ali Aly
- Cornell University College of Veterinary Medicine, Ithaca, New York, USA
| | | | - Shiori Arai
- College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota, USA
| | | | - Jana Gordon
- Oregon State University, Corvallis, Oregon, USA
| | | | - Tobias Schwarz
- Royal (Dick) School of Veterinary Studies, University of Edinburgh, Roslin, UK
| | - Mandy L Wallace
- College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
| | - Julia Graham
- Cummings School of Veterinary Medicine at Tufts University, North Grafton, Massachusetts, USA
| | - Robert Hardie
- School of Veterinary Medicine, University of Wisconsin, Madison, Wisconsin, USA
| | - Yifu Chang
- Mercy Animal Hospital, Kaohsiung City, Taiwan
| | - Mitch Robbins
- Veterinary Specialty Center, Bannockburn, Illinois, USA
| | | | - James Karnia
- University of Missouri Veterinary Health Center, Columbia, Missouri, USA
| | - Allyson Sterman
- Purdue University College of Veterinary Medicine, West Lafayette, Indiana, USA
| | - Ashley Saunders
- College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | | | | | | | - Petra Černá
- Colorado State University Veterinary Teaching Hospital, Fort Collins, Colorado, USA
| | | | - Josep Aisa
- University of Tennessee College of Veterinary Medicine, Knoxville, Tennessee, USA
| | - Anjile An
- Weill Cornell Medicine, New York Presbyterian, New York, New York, USA
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Farhoodimoghadam M, Reagan KL, Zwingenberger AL. Diagnosis and classification of portosystemic shunts: a machine learning retrospective case-control study. Front Vet Sci 2024; 11:1291318. [PMID: 38638645 PMCID: PMC11024426 DOI: 10.3389/fvets.2024.1291318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 03/21/2024] [Indexed: 04/20/2024] Open
Abstract
Diagnosis of portosystemic shunts (PSS) in dogs often requires multiple diagnostic tests, and available clinicopathologic tests have limitations in sensitivity and specificity. The objective of this study was to train and validate a machine learning model (MLM) that can accurately predict the presence of a PSS utilizing routinely collected demographic data and clinicopathologic features. Dogs diagnosed with PSS or control dogs tested for PSS but had the condition ruled out (non-PSS) were identified. Dogs were included if a complete blood count and serum chemistry panel were available from PSS diagnostic testing. Dogs with a PSS were subcategorized as having a single intrahepatic PSS, a single extrahepatic PSS, or multiple extrahepatic PSS. An extreme gradient boosting (XGboost) MLM was trained with data from 70% of the cases, and MLM performance was determined on the test set, comprising the remaining 30% of the case data. Two MLMs were created. The first was designed to predict the presence of any PSS (PSS MLM), and the second to predict the PSS subcategory (PSS SubCat MLM). The trained PSS MLM had a sensitivity of 94.3% (95% CI 90.1-96.8%) and specificity of 90.5% (95% CI 85.32-94.0%) for dogs in the test set. The area under the receiver operator characteristic curve (AUC) was 0.976 (95% CI; 0.964-0.989). The mean corpuscular hemoglobin, lymphocyte count, and serum globulin concentration were most important in prediction classification. The PSS SubCat MLM had an accuracy of 85.7% in determining the subtype of PSS of dogs in the test set, with variable sensitivity and specificity depending on PSS subtype. These MLMs have a high accuracy for diagnosing PSS; however, the prediction of PSS subclassification is less accurate. The MLMs can be used as a screening tool to increase or decrease the index of suspicion for PSS before confirmatory diagnostics such as advanced imaging are pursued.
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Affiliation(s)
- Makan Farhoodimoghadam
- Department of Computer Science, University of California, Davis, Davis, CA, United States
| | - Krystle L. Reagan
- Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
| | - Allison L. Zwingenberger
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
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Choen S, Kent MS, Chaudhari AJ, Cherry SR, Krtolica A, Zwingenberger AL. Kinetic Evaluation of the Hypoxia Radiotracers [ 18F]FMISO and [ 18F]FAZA in Dogs with Spontaneous Tumors Using Dynamic PET/CT Imaging. Nucl Med Mol Imaging 2023; 57:16-25. [PMID: 36643946 PMCID: PMC9832187 DOI: 10.1007/s13139-022-00780-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 08/12/2022] [Accepted: 09/28/2022] [Indexed: 02/01/2023] Open
Abstract
Purpose We evaluated the kinetics of the hypoxia PET radiotracers, [18F]fluoromisonidazole ([18F]FMISO) and [18F]fluoroazomycin-arabinoside ([18F]FAZA), for tumor hypoxia detection and to assess the correlation of hypoxic kinetic parameters with static imaging measures in canine spontaneous tumors. Methods Sixteen dogs with spontaneous tumors underwent a 150-min dynamic PET scan using either [18F]FMISO or [18F]FAZA. The maximum tumor-to-muscle ratio (TMRmax) > 1.4 on the last image frame was used as the standard threshold to determine tumor hypoxia. The tumor time-activity curves were analyzed using irreversible and reversible two-tissue compartment models and graphical methods. TMRmax was compared with radiotracer trapping rate (k 3), influx rate (K i), and distribution volume (V T). Results Tumor hypoxia was detected in 7/8 tumors in the [18F]FMISO group and 4/8 tumors in the [18F]FAZA group. All hypoxic tumors were detected at > 120 min with [18F]FMISO and at > 60 min with [18F]FAZA. [18F]FAZA showed better fit with the reversible model. TMRmax was strongly correlated with the irreversible parameters (k 3 and K i) for [18F]FMISO at > 90 min and with the reversible parameter (V T) for [18F]FAZA at > 120 min. Conclusions Our results showed that [18F]FAZA provided a promising alternative radiotracer to [18F]FMISO with detecting the presence of tumor hypoxia at an earlier time (60 min), consistent with its favorable faster kinetics. The strong correlation between TMRmax over the 90-150 min and 120-150 min timeframes with [18F]FMISO and [18F]FAZA, respectively, with kinetic parameters associated with tumor hypoxia for each radiotracer, suggests that a static scan measurement (TMRmax) is a good alternative to quantify tumor hypoxia. Supplementary Information The online version contains supplementary material available at 10.1007/s13139-022-00780-4.
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Affiliation(s)
- Sangkyung Choen
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA USA
| | - Michael S. Kent
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA USA
| | - Abhijit J. Chaudhari
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA USA ,Department of Radiology, School of Medicine, University of California, CA Sacramento, USA
| | - Simon R. Cherry
- Department of Biomedical Engineering, College of Engineering, University of California, Davis, CA USA
| | | | - Allison L. Zwingenberger
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA USA
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Pey P, Specchi S, Rossi F, Diana A, Drudi I, Zwingenberger AL, Mayhew PD, Pisoni L, Mari D, Massari F, Dalpozzo B, Fracassi F, Nicoli S. Prediction of vascular invasion using a 7-point scale computed tomography grading system in adrenal tumors in dogs. J Vet Intern Med 2022; 36:713-725. [PMID: 35233853 PMCID: PMC8965227 DOI: 10.1111/jvim.16371] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 01/14/2022] [Accepted: 01/14/2022] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Previous studies evaluating the accuracy of computed tomography (CT) in detecting caudal vena cava (CVC) invasion by adrenal tumors (AT) used a binary system and did not evaluate for other vessels. OBJECTIVE Test a 7-point scale CT grading system for accuracy in predicting vascular invasion and for repeatability among radiologists. Build a decision tree based on CT criteria to predict tumor type. METHODS Retrospective observational cross-sectional case study. Abdominal CT studies were analyzed by 3 radiologists using a 7-point CT grading scale for vascular invasion and by 1 radiologist for CT features of AT. ANIMALS Dogs with AT that underwent adrenalectomy and had pre- and postcontrast CT. RESULTS Ninety-one dogs; 45 adrenocortical carcinomas (50%), 36 pheochromocytomas (40%), 9 adrenocortical adenomas (10%) and 1 unknown tumor. Carcinoma and pheochromocytoma differed in pre- and postcontrast attenuation, contralateral adrenal size, tumor thrombus short- and long-axis, and tumor and thrombus mineralization. A decision tree was built based on these differences. Adenoma and malignant tumors differed in contour irregularity. Probability of vascular invasion was dependent on CT grading scale, and a large equivocal zone existed between 3 and 6 scores, lowering CT accuracy to detect vascular invasion. Radiologists' agreement for detecting abnormalities (evaluated by chance-corrected weighted kappa statistics) was excellent for CVC and good to moderate for other vessels. The quality of postcontrast CT study had a negative impact on radiologists' performance and agreement. CONCLUSIONS AND CLINICAL IMPORTANCE Features of CT may help radiologists predict AT type and provide probabilistic information on vascular invasion.
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Affiliation(s)
- Pascaline Pey
- Department of Veterinary Medical ScienceAlma Mater Studiorum, University of BolognaOzzano Emilia (BO)Italy,Antech Imaging Services, IrvineCAUSA
| | - Swan Specchi
- Ospedale Veterinario i Portoni RossiBologna (BO)Italy
| | - Federica Rossi
- Clinica Veterinaria dell'OrologioSasso Marconi (BO)Italy
| | - Alessia Diana
- Department of Veterinary Medical ScienceAlma Mater Studiorum, University of BolognaOzzano Emilia (BO)Italy
| | - Ignazio Drudi
- Department of Statistical SciencesAlma Mater Studiorum, University of BolognaBologna (BO)Italy
| | - Allison L. Zwingenberger
- Department of Surgical & Radiological SciencesSchool of Veterinary Medicine, University of CaliforniaDavisCaliforniaUSA
| | - Philipp D. Mayhew
- Department of Surgical & Radiological SciencesSchool of Veterinary Medicine, University of CaliforniaDavisCaliforniaUSA
| | - Luciano Pisoni
- Department of Veterinary Medical ScienceAlma Mater Studiorum, University of BolognaOzzano Emilia (BO)Italy
| | | | | | - Boris Dalpozzo
- Clinica Veterinaria dell'OrologioSasso Marconi (BO)Italy
| | - Federico Fracassi
- Department of Veterinary Medical ScienceAlma Mater Studiorum, University of BolognaOzzano Emilia (BO)Italy
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Choen S, McLarty EM, Pascoe P, Zwingenberger AL. Positive-pressure breath-hold positron emission tomography/computed tomography is feasible for respiratory-induced artifact reduction in healthy dogs. Am J Vet Res 2022; 83:405-411. [PMID: 35175931 DOI: 10.2460/ajvr.21.08.0102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To perform qualitative and quantitative analysis of positron emission tomography (PET)/CT images using spontaneous ventilation (SV) and positive-pressure breath-hold (PPBH) techniques in order to demonstrate the feasibility of PPBH PET/CT to decrease respiration-induced artifacts. ANIMALS 5 healthy female mixed-breed dogs. PROCEDURES 2-([18F]fluoro)-2-deoxy-D-glucose (was administered to each anesthetized dog. An SV PET/CT scan was performed from the head to the femur using 8 bed positions (3 min/bed) followed by a PPBH scan centered over the diaphragm with a single bed position (1.5 min/bed). PET image quality, the misalignment of organs between PET and CT images, and standardized uptake values (SUVs) of liver adjacent to diaphragm were compared between SV and PPBH. RESULTS Overall image quality and conspicuity of anatomic structures were superior in PPBH than in SV PET images. PPBH induced significantly less misalignment of the liver and diaphragm in all planes compared to SV. For the gall bladder, PPBH showed significantly less misalignment than SV only in the transverse plane. The maximum SUV in all of the liver areas was significantly higher with PPBH compared to SV. PPBH exhibited significantly higher mean SUV in the liver adjacent to the left diaphragmatic dome and left lateral border and higher minimum SUV only in the liver adjacent to the left diaphragmatic dome. CLINICAL RELEVANCE PPBH was demonstrated to be a feasible PET/CT protocol with higher PET image quality, less organ misalignment on fused PET/CT, and more accurate SUVs of the liver compared to SV PET/CT in healthy dogs.
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Willcox JL, Spriet M, Zwingenberger AL, Phillips KL, Burton JH, Skorupski KA, Hansen KS, Affolter VK, Woolard KD, Beylin D, Giuffrida MA. Evaluation of accuracy for 18 F-FDG positron emission tomography and computed tomography for detection of lymph node metastasis in canine oral malignant melanoma. Vet Comp Oncol 2021; 19:463-472. [PMID: 32892513 DOI: 10.1111/vco.12651] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 08/05/2020] [Accepted: 08/27/2020] [Indexed: 12/12/2022]
Abstract
Tumour stage has been demonstrated to have prognostic significance in canine oral malignant melanoma (OMM). Various evaluation techniques of positron emission tomography/computed tomography (PET/CT) have been reported for staging of head-and-neck tumours in people, but canine-specific data are limited, and reports for CT accuracy have been variable. In this prospective study, the head/neck of client-owned dogs with cytologically or histologically diagnosed OMM were imaged with 18 Fluorine-fluorodeoxyglucose (18 F-FDG) PET/ CT. Bilateral mandibular lymphadenectomy was performed for histopathologic assessment. Two evaluation techniques for CT and PET were applied by four independent observers. CT evaluation utilized both a standardized grading scheme and a subjective clinical interpretation. PET evaluation was first performed solely on 18 F-FDG-uptake in lymph nodes compared to background on a truncated scan excluding the oral cavity. Subsequently, the entire head/neck scan and standardized uptake value (SUV) measurements were available. Receiver operating characteristic analysis was performed with histopathology as gold standard. Twelve dogs completed the study and metastatic OMM was identified in six mandibular lymph nodes from five dogs. Of the CT-interpretation techniques, use of clinical grading performed best (sensitivity = 83% and specificity = 94%). Both PET techniques resulted in 100% sensitivity, but primary tumour site evaluation and use of SUV increased specificity from 78% to 94%. The SUVmax cut-point, 3.3, led to 100% sensitivity and 83% specificity. In this population of dogs, PET appeared to be highly sensitive but at risk of being less specific without use of appropriate parameters and thresholds.
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Affiliation(s)
- Jennifer L Willcox
- Department of Veterinary Surgery and Radiology, University of California, Davis, Davis, California, USA
| | - Mathieu Spriet
- Department of Veterinary Surgery and Radiology, University of California, Davis, Davis, California, USA
| | - Allison L Zwingenberger
- Department of Veterinary Surgery and Radiology, University of California, Davis, Davis, California, USA
| | - Kathryn L Phillips
- Department of Veterinary Surgery and Radiology, University of California, Davis, Davis, California, USA
| | - Jenna H Burton
- Department of Veterinary Surgery and Radiology, University of California, Davis, Davis, California, USA
| | - Katherine A Skorupski
- Department of Veterinary Surgery and Radiology, University of California, Davis, Davis, California, USA
| | - Katherine S Hansen
- Department of Veterinary Surgery and Radiology, University of California, Davis, Davis, California, USA
| | - Verena K Affolter
- Department of Pathology, Microbiology and Immunology, University of California, Davis, Davis, California, USA
| | - Kevin D Woolard
- Department of Pathology, Microbiology and Immunology, University of California, Davis, Davis, California, USA
| | - David Beylin
- Brain Biosciences, Inc, Rockville, Maryland, USA
| | - Michelle A Giuffrida
- Department of Veterinary Surgery and Radiology, University of California, Davis, Davis, California, USA
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Wanamaker MW, Vernau KM, Taylor SL, Cissell DD, Abdelhafez YG, Zwingenberger AL. Classification of neoplastic and inflammatory brain disease using MRI texture analysis in 119 dogs. Vet Radiol Ultrasound 2021; 62:445-454. [PMID: 33634942 PMCID: PMC9970026 DOI: 10.1111/vru.12962] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 01/06/2021] [Accepted: 01/10/2021] [Indexed: 01/06/2023] Open
Abstract
Magnetic resonance imaging is the primary method used to diagnose canine glial cell neoplasia and noninfectious inflammatory meningoencephalitis. Subjective differentiation of these diseases can be difficult due to overlapping imaging characteristics. This study utilizes texture analysis (TA) of intra-axial lesions both as a means to quantitatively differentiate these broad categories of disease and to help identify glial tumor grade/cell type and specific meningoencephalitis subtype in a group of 119 dogs with histologically confirmed diagnoses. Fifty-nine dogs with gliomas and 60 dogs with noninfectious inflammatory meningoencephalitis were retrospectively recruited and randomly split into training (n = 80) and test (n = 39) cohorts. Forty-five of 120 texture metrics differed significantly between cohorts after correcting for multiple testing (false discovery rate < 0.05). After training the random forest algorithm, the classification accuracy for the test set was 85% (sensitivity 89%, specificity 81%). TA was only partially able to differentiate the inflammatory subtypes (granulomatous meningoencephalitis [GME], necrotizing meningoencephalitis [NME], and necrotizing leukoencephalitis [NLE]) (out-of-bag error rate of 35.0%) and was unable to identify metrics that could correctly classify glioma grade or cell type (out-of-bag error rate of 59.6% and 47.5%, respectively). Multiple demographic differences, such as patient age, sex, weight, and breed were identified between disease cohorts and subtypes which may be useful in prioritizing differential diagnoses. TA of MR images with a random forest algorithm provided classification accuracy of inflammatory and neoplastic brain disease approaching the accuracy of previously reported subjective radiologist evaluation.
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Affiliation(s)
- Mason W. Wanamaker
- William R. Pritchard Veterinary Medical Teaching Hospital, University of California, Davis 95616, CA
| | - Karen M. Vernau
- Department of Surgical and Radiological Sciences, University of California, Davis 95616, CA
| | | | - Derek D. Cissell
- Department of Surgical and Radiological Sciences, University of California, Davis 95616, CA
| | - Yasser G. Abdelhafez
- Department of Radiology University of California Davis School of Medicine, Sacramento 95817, CA
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Krol L, Vernau W, Mutlow AG, Brady SM, Wack RF, Kubly S, Zwingenberger AL, Culp WTN, Palm C, Rebhun RB. Unusual splenic B-cell lymphoma in two related Sumatran tigers ( Panthera tigris sumatrae). J Am Vet Med Assoc 2021; 257:1288-1293. [PMID: 33269968 DOI: 10.2460/javma.257.12.1288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
CASE DESCRIPTION A 14-year-old 120-kg (264-lb) sexually intact male Sumatran tiger (Panthera tigris sumatrae) and its 10-year-old 130-kg (286-lb) sexually intact male offspring were housed separately and evaluated independently after experiencing weeks of ongoing malaise, weight loss, and anorexia. CLINICAL FINDINGS Both animals were immobilized and anesthetized for physical examinations and diagnostic testing. Complete blood counts revealed leukopenia and anemia in both tigers. Splenomegaly was identified on abdominal ultrasonography. Cytologic examination and immunohistochemical staining of splenic samples confirmed intermediate to large B-cell lymphoma; no evidence of lymphoma in surrounding organs was noted. TREATMENT AND OUTCOME The sire was treated with lomustine and prednisolone. This tiger was euthanized 21 months after initiation of treatment because of chronic progressive renal disease. The male offspring was treated with l-asparaginase but did not respond to the treatment. A splenectomy was performed, and malaise and anorexia resolved. No further chemotherapy was administered, and the male offspring was instead maintained on a low dose of prednisolone. Thirty-two months after diagnosis, the male offspring was still considered to be in remission. CLINICAL RELEVANCE To our knowledge, this was the first known report of the diagnosis and management of a splenic B-cell lymphoma in a tiger. Both tigers achieved positive clinical responses and long-term survival by means of different treatment modalities. The finding of such an unusual neoplasm in a male tiger and its male offspring was noteworthy, raising the possibility of a genetic predisposition for this lymphoma type.
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Wilson S, Culp WTN, Wisner ER, Cissell DD, Finn JP, Zwingenberger AL. Ferumoxytol-enhanced magnetic resonance angiography provides comparable vascular conspicuity to CT angiography in dogs with intrahepatic portosystemic shunts. Vet Radiol Ultrasound 2021; 62:463-470. [PMID: 33634935 DOI: 10.1111/vru.12963] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 01/08/2021] [Accepted: 01/10/2021] [Indexed: 11/26/2022] Open
Abstract
Computed tomography angiography (CTA) is currently the gold standard imaging modality for anatomically characterizing canine hepatic vascular anomalies; with conventional, gadolinium-enhanced MR angiography being less frequently utilized. However, both imaging modalities are limited by a brief, first pass peak of contrast medium in the vasculature that necessitates precisely timed image acquisition. A long-acting purely intravascular magnetic resonance imaging (MRI) contrast agent, ferumoxytol, offers the potential to reduce complexity of magnetic resonance angiography (MRA) protocol planning by ensuring diagnostic contrast medium concentration in all the vessels that are targeted for imaging. Aims of this prospective, pilot, methods comparison study were to develop an optimized MRA protocol using ferumoxytol in dogs with hepatic vascular anomalies, perform a dose escalation trial to compare image quality with four-dose regimens of ferumoxytol, and compare accuracy of vascular anatomic depiction based on the gold standard of CTA. Six dogs (10.7-36.1 kg) with portosystemic shunts (four intrahepatic left divisional shunts and two intrahepatic right divisional shunts) were recruited for inclusion in the study. A dose-escalation trial was performed to compare image quality at four incremental dose levels of ferumoxytol (1, 2, 3, and 4 mg/kg) and to compare the accuracy of vascular anatomic detection to CTA. Ferumoxytol contrast-enhanced MRA (CE-MRA) at 4 mg/kg provided similar conspicuity of normal and abnormal vasculature compared to CTA with a minimal decrease in spatial resolution. Findings indicated that ferumoxytol holds promise for comprehensive, single breath hold CE-MRA of all abdominal vessels in dogs with portosystemic shunts. Background information provided in this study can be used to support development of other future applications such as intracranial and cardiac MRA, real-time imaging, flow quantification, and potentially sedated MRI imaging.
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Affiliation(s)
- Sabrina Wilson
- Department of Surgical and Radiological Sciences, University of California Davis, School of Veterinary Medicine, Davis, California, USA
| | - William T N Culp
- Department of Surgical and Radiological Sciences, University of California Davis, School of Veterinary Medicine, Davis, California, USA
| | - Erik R Wisner
- Department of Surgical and Radiological Sciences, University of California Davis, School of Veterinary Medicine, Davis, California, USA
| | - Derek D Cissell
- Department of Surgical and Radiological Sciences, University of California Davis, School of Veterinary Medicine, Davis, California, USA
| | - J Paul Finn
- Diagnostic Cardiovascular Imaging Research Laboratory, Department of Radiology, David Geffen School of Medicine, University of California Los Angeles, School of Medicine, Davis, California, USA
| | - Allison L Zwingenberger
- Department of Surgical and Radiological Sciences, University of California Davis, School of Veterinary Medicine, Davis, California, USA
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Culp WTN, Griffin MA, Case JB, Zwingenberger AL, Marks SL. Use of percutaneous transvenous coil embolization in the treatment of intrahepatic portosystemic shunts in four cats. J Am Vet Med Assoc 2021; 257:70-79. [PMID: 32538708 DOI: 10.2460/javma.257.1.70] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
CASE DESCRIPTION 4 cats (6 to 9 months old) were evaluated because of clinical signs consistent with a portosystemic shunt (PSS). CLINICAL FINDINGS Among the 4 cats, 3 had neurologic abnormalities including ataxia, head pressing, disorientation, and obtundation. One cat was evaluated because of urethral obstruction; a retrieved urethral stone was determined to have urate composition. Clinicopathologic findings (hypoproteinemia, low BUN concentration, and high serum bile acids concentration) were consistent with a PSS in all cats. A diagnosis of intrahepatic PSS (IHPSS) was made for all cats on the basis of ultrasonographic and CT findings. TREATMENT AND OUTCOME All cats underwent percutaneous transvenous coil embolization (PTCE). No major intraprocedural complications were encountered, and all cats were discharged from the hospital. For the 3 cats that were presented with neurologic signs, an evaluation performed at 12, 14, or 48 months after the procedure revealed resolution of the neurologic signs, and owners reported that the behavior of each cat appeared normal. One cat that initially had neurologic and gastrointestinal signs had lower urinary tract signs after PTCE and developed an acquired extrahepatic PSS. CLINICAL RELEVANCE Although IHPSSs in cats are uncommon, the outcomes of PTCE for the 4 cats of the present report suggested that this treatment may benefit cats with an IHPSS. No short-term complications were encountered, and all cats had improvement in clinical signs following PTCE, although an acquired extrahepatic PSS was later identified in 1 cat. Further investigation of the use of endovascular techniques for the treatment of IHPSSs in cats and other species is warranted.
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Plested MJ, Zwingenberger AL, Brockman DJ, Hecht S, Secrest S, Culp WTN, Drees R. Canine intrahepatic portosystemic shunt insertion into the systemic circulation is commonly through primary hepatic veins as assessed with CT angiography. Vet Radiol Ultrasound 2020; 61:519-530. [PMID: 32663370 DOI: 10.1111/vru.12892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 03/15/2020] [Accepted: 04/27/2020] [Indexed: 02/06/2023] Open
Abstract
Congenital intrahepatic portosystemic shunts (IHPSS) in dogs are traditionally classified as right, left, or central divisional. There are few descriptive studies regarding the variation of IHPSS within these categories. This multicenter, analytical, cross-sectional study aimed to describe a large series of dogs with CT angiography (CTA) of IHPSS, hypothesizing that there would be variation to the existing classification. Ninety CTA studies were assessed for IHPSS type, insertion, and the relationship of the insertion to the primary hepatic veins. Ninety-two percent of IHPSS inserted into a primary hepatic vein (HV) or phrenic vein, 8% inserted directly into the ventral aspect of the intrahepatic caudal vena cava. The most common IHPSS type was a single right divisional (44%), including those inserting via the right lateral HV or the caudate HV. Left divisional IHPSS (33%) inserted into the left HV or left phrenic vein. Central divisional IHPSS (13%) inserted into the quadrate HV, central HV, dorsal right medial HV, or directly into the ventral aspect of the intrahepatic caudal vena cava. Multiple sites of insertion were seen in 9% of dogs. Within left, central, and right divisional types, further subclassifications can therefore commonly be defined based on the hepatic veins with which the shunting vessel communicates. Relating IHPSS morphology to the receiving primary HV could make IHPSS categorization more consistent and may influence the type and method of IHPSS attenuation recommended.
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Affiliation(s)
- Mark J Plested
- Department of Clinical Sciences and Services, Royal Veterinary College, University of London, North Mymms, Hertfordshire, UK
| | - Allison L Zwingenberger
- Department of Surgical and Radiological Sciences, Davis, School of Veterinary Medicine, University of California, Davis, California, USA
| | - Daniel J Brockman
- Department of Clinical Sciences and Services, Royal Veterinary College, University of London, North Mymms, Hertfordshire, UK
| | - Silke Hecht
- Department of Small Animal Clinical Sciences, University of Tennessee, Knoxville, Tennessee, USA
| | - Scott Secrest
- Department of Veterinary Biosciences and Diagnostic Imaging, University of Georgia College of Veterinary Medicine, Athens, Georgia, USA
| | - William T N Culp
- Department of Small Animal Clinical Sciences, University of Tennessee, Knoxville, Tennessee, USA
| | - Randi Drees
- Department of Clinical Sciences and Services, Royal Veterinary College, University of London, North Mymms, Hertfordshire, UK
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12
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Gallastegui A, Davies E, Zwingenberger AL, Nykamp S, Rishniw M, Johnson PJ. MRI has limited agreement with CT in the evaluation of vertebral fractures of the canine trauma patient. Vet Radiol Ultrasound 2019; 60:533-542. [PMID: 31309654 DOI: 10.1111/vru.12785] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 05/06/2019] [Accepted: 05/13/2019] [Indexed: 11/26/2022] Open
Abstract
Complete assessment of vertebral trauma in dogs currently requires CT and MRI for evaluation of the osseous and soft tissue structures that contribute to vertebral stability. Some studies in people have suggested that MRI may be sensitive and specific at detecting vertebral fractures making this potentially a single modality that could be used in spinal trauma evaluation. This study aimed to assess the ability for observers to evaluate vertebral fractures using MRI when compared to CT, which was used as the reference standard. Twenty-nine dogs with previously diagnosed acute vertebral fractures and four dogs with no vertebral fracture that had undergone sequential CT and MRI were included into the study. One hundred twenty-eight vertebrae were evaluated for the presence of fractures. Imaging studies were read by two observers blinded to the history. While both observers had similarly high sensitivity and specificity for simple detection of any fractured vertebrae, interobserver agreement was only moderate (κ = 0.584). When evaluations were specifically limited to detection of structurally unstable fractured vertebrae both observers showed improved specificity and interobserver agreement became substantial (κ = 0.650). Complete agreement for exact fracture location between MRI and CT results was only achieved in 14.3-32.6% of fractured vertebra with up to 79% of fractures being missed in some vertebral structures. This suggests that although MRI may be able to detect the presence of fractured vertebrae, it is not able to replace CT for the complete evaluation of the traumatized spine and documentation of fracture morphology.
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Affiliation(s)
- Aitor Gallastegui
- College of Veterinary Medicine, University of Florida, Gainesville, Florida
| | - Emma Davies
- Cornell College of Veterinary Medicine, Cornell University, Ithaca, New York
| | | | - Stephanie Nykamp
- The Ontario Veterinary College Health Sciences Center, University of Guelph, Guelph, Ontario, Canada
| | - Mark Rishniw
- Cornell College of Veterinary Medicine, Cornell University, Ithaca, New York
| | - Philippa J Johnson
- Cornell College of Veterinary Medicine, Cornell University, Ithaca, New York
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13
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Mayhew PD, Boston SE, Zwingenberger AL, Giuffrida MA, Runge JJ, Holt DE, Raleigh JS, Singh A, Culp WTN, Case JB, Steffey MA, Balsa IM. Perioperative morbidity and mortality in dogs with invasive adrenal neoplasms treated by adrenalectomy and cavotomy. Vet Surg 2019; 48:742-750. [PMID: 31034643 DOI: 10.1111/vsu.13221] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 03/11/2019] [Accepted: 04/09/2019] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To report the morbidity and mortality associated with adrenalectomy with cavotomy for resection of invasive adrenal neoplasms in dogs and evaluate risk factors for perioperative outcomes. STUDY DESIGN Retrospective study. ANIMALS Forty-five client-owned dogs. METHODS Dogs that underwent open adrenalectomy with cavotomy for resection of adrenal masses with tumor thrombus extending into the vena cava were included. Clinicopathologic data were harvested from medical records. Selected clinical, imaging, and operative variables were statistically evaluated as risk factors for packed red blood cell transfusion, nephrectomy, perioperative death, and overall survival. RESULTS Thirty-six of 45 masses were pheochromocytomas, 7 were adrenocortical carcinomas, and 2 were unknown type. Caval thrombus terminated prehepatically in 21 of 45 dogs and extended beyond the porta hepatis but terminated prediaphragmatically (intrahepatic prediaphragmatic location) in 15 dogs and thrombi extended postdiaphragmatically in 5 dogs. Thirty-four (76%) dogs were discharged from the hospital, and 11 (24%) dogs died or were euthanized prior to discharge. Median overall survival time for all 45 dogs was 547 days (95%CI 146-710). Bodyweight, tumor type, and size and extent of caval thrombus did not affect survival to discharge, but postdiaphragmatic (rather than prediaphragmatic) thrombus termination was associated with a greater risk of death. CONCLUSION Long-term survival was common in dogs that survived the perioperative period. Postdiaphragmatic thrombus extension affected the prognosis for overall survival. CLINICAL SIGNIFICANCE Findings of this study help to stratify operative risk in dogs with adrenal neoplasia and caval invasion.
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Affiliation(s)
- Philipp D Mayhew
- School of Veterinary Medicine, University of California-Davis, Davis, California
| | - Sarah E Boston
- VCA Canada, 404 Veterinary Emergency and Referral Hospital, Newmarket, Ontario, Canada
| | | | - Michelle A Giuffrida
- School of Veterinary Medicine, University of California-Davis, Davis, California
| | - Jeffrey J Runge
- Matthew J. Ryan Veterinary Hospital at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - David E Holt
- Matthew J. Ryan Veterinary Hospital at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Joseph S Raleigh
- School of Veterinary Medicine, University of California-Davis, Davis, California
| | - Ameet Singh
- Departments of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada
| | - William T N Culp
- School of Veterinary Medicine, University of California-Davis, Davis, California
| | - J Brad Case
- School of Veterinary Medicine, University of Florida, Gainesville, Florida
| | - Michele A Steffey
- School of Veterinary Medicine, University of California-Davis, Davis, California
| | - Ingrid M Balsa
- School of Veterinary Medicine, University of California-Davis, Davis, California
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14
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Hansen KS, Zwingenberger AL, Théon AP, Kent MS. Long-term survival with stereotactic radiotherapy for imaging-diagnosed pituitary tumors in dogs. Vet Radiol Ultrasound 2018; 60:219-232. [PMID: 30575174 DOI: 10.1111/vru.12708] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 09/20/2018] [Accepted: 09/23/2018] [Indexed: 12/16/2022] Open
Abstract
Published studies on the use of stereotactic radiotherapy for dogs with pituitary tumors are limited. This retrospective observational study describes results of stereotactic radiotherapy for 45 dogs with imaging-diagnosed pituitary tumors. All dogs were treated at a single hospital during the period of December 2009-2015. The stereotactic radiotherapy was delivered in one 15 Gray (Gy) fraction or in three 8 Gy fractions. At the time of analysis, 41 dogs were deceased. Four were alive and censored from all survival analyses; one dog received 8 Gy every other day and was removed from protocol analyses. The median overall survival from first treatment was 311 days (95% confidence interval 226-410 days [range 1-2134 days]). Thirty-two dogs received 15 Gy (median overall survival 311 days; 95% confidence interval [range 221-427 days]), and 12 received 24 Gy on three consecutive days (median overall survival 245 days, 95% confidence interval [range 2-626 days]). Twenty-nine dogs had hyperadrenocorticism (median overall survival 245 days), while 16 had nonfunctional masses (median overall survival 626 days). Clinical improvement was reported in 37/45 cases. Presumptive signs of acute adverse effects within 4 months of stereotactic radiotherapy were noted in 10/45, and most had improvement spontaneously or with steroids. Late effects versus tumor progression were not discernable, but posttreatment blindness (2), hypernatremia (2), and progressive neurological signs (31) were reported. There was no statistical difference in median overall survival for different protocols. Patients with nonfunctional masses had longer median overall survival than those with hyperadrenocorticism (P = 0.0003). Survival outcomes with stereotactic radiotherapy were shorter than those previously reported with definitive radiation, especially for dogs with hyperadrenocorticism.
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Affiliation(s)
- Katherine S Hansen
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616
| | - Allison L Zwingenberger
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616
| | - Alain P Théon
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616
| | - Michael S Kent
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616
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15
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Reetz JA, Suran JN, Zwingenberger AL, Stefanovski D. Nodules and masses are associated with malignant pleural effusion in dogs and cats but many other intrathoracic CT features are poor predictors of the effusion type. Vet Radiol Ultrasound 2018; 60:289-299. [DOI: 10.1111/vru.12706] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 10/24/2018] [Accepted: 10/27/2018] [Indexed: 11/29/2022] Open
Affiliation(s)
- Jennifer A. Reetz
- Department of Clinical Sciences and Advanced MedicineUniversity of Pennsylvania School of Veterinary Medicine Philadelphia PA 19014
| | - Jantra N. Suran
- Department of Clinical Sciences and Advanced MedicineUniversity of Pennsylvania School of Veterinary Medicine Philadelphia PA 19014
| | - Allison L. Zwingenberger
- Department of Surgical and Radiological SciencesUniversity of California Davis School of Veterinary Medicine Davis CA 95616
| | - Darko Stefanovski
- Department of Clinical Studies New Bolton CenterUniversity of Pennsylvania School of Veterinary Medicine Kennett Square PA 19348
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16
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Berlato D, Zwingenberger AL, Ruiz-Drebing M, Pradel J, Clark N, Kent MS. Canine meningiomas treated with three-dimensional conformal radiation therapy require magnetic resonance imaging to avoid a geographic miss. Vet Radiol Ultrasound 2018; 59:777-785. [DOI: 10.1111/vru.12653] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 04/11/2018] [Accepted: 04/12/2018] [Indexed: 12/31/2022] Open
Affiliation(s)
- Davide Berlato
- Animal Health Trust; Centre for Small Animal Studies; Suffolk CB87UU UK
| | - Allison L Zwingenberger
- Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California, Davis; Davis CA 95616
| | | | - Julie Pradel
- Animal Health Trust; Centre for Small Animal Studies; Suffolk CB87UU UK
| | - Nicola Clark
- Animal Health Trust; Centre for Small Animal Studies; Suffolk CB87UU UK
| | - Michael S Kent
- Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California, Davis; Davis CA 95616
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17
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Gustavsen KA, Paul-Murphy JR, Weber ES, Zwingenberger AL, Dunker FH, Dubielzig RR, Reilly CM, Murphy CJ. Ocular anatomy of the black pacu (Colossoma macropomum): gross, histologic, and diagnostic imaging. Vet Ophthalmol 2018; 21:507-515. [DOI: 10.1111/vop.12539] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Kate A. Gustavsen
- Department of Medicine and Epidemiology; School of Veterinary Medicine; University of California; Davis CA 95616 USA
- Lincoln Park Zoo; 2001 N. Clark St Chicago IL 60614 USA
| | - Joanne R. Paul-Murphy
- Department of Medicine and Epidemiology; School of Veterinary Medicine; University of California; Davis CA 95616 USA
| | - Ernest Scott Weber
- Department of Medicine and Epidemiology; School of Veterinary Medicine; University of California; Davis CA 95616 USA
- USDA APHIS Veterinary Services; Richmond VA 23219 USA
| | - Allison L. Zwingenberger
- Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California; Davis CA 95616 USA
| | - Freeland H. Dunker
- Steinhart Aquarium; California Academy of Sciences; San Francisco CA 94118 USA
| | - Richard R. Dubielzig
- Department of Pathobiological Sciences; School of Veterinary Medicine; University of Wisconsin; Madison WI 53706 USA
| | - Christopher M. Reilly
- Department of Pathology, Microbiology, and Immunology; School of Veterinary Medicine; University of California; Davis CA 95616 USA
- Insight Veterinary Specialty Pathology; 5310 Evans Ave Austin TX 78751 USA
| | - Christopher J. Murphy
- Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California; Davis CA 95616 USA
- Department of Ophthalmology & Vision Science, School of Medicine; University of California; Davis CA 95616 USA
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18
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Couto KM, Moore PF, Zwingenberger AL, Willcox JL, Skorupski KA. Clinical characteristics and outcome in dogs with small cell T-cell intestinal lymphoma. Vet Comp Oncol 2018; 16:337-343. [PMID: 29322604 DOI: 10.1111/vco.12384] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 12/14/2017] [Accepted: 12/15/2017] [Indexed: 12/31/2022]
Abstract
Small cell intestinal lymphoma has not been well characterized in dogs. The objective of this study was to describe clinical characteristics and outcome in dogs with small cell intestinal lymphoma. We hypothesized that affected dogs would have prolonged survival compared with high-grade gastrointestinal (GI) lymphoma. Pathology records were searched for dogs with histologically confirmed small cell GI lymphoma. Seventeen dogs with confirmed small cell intestinal lymphoma were identified, and clinical and outcome data were retrospectively collected. Histopathology was reviewed by a board-certified pathologist, and tissue sections were subjected to immunophenotyping and molecular clonality assessment. All dogs had small cell, T-cell, lymphoma confirmed within various regions of small intestine, with 1 dog also having disease in abdominal lymph nodes. All dogs had clinical signs attributable to GI disease; diarrhoea (n = 13) was most common. Ultrasonographic abnormalities were present in 8 of 13 dogs with abnormal wall layering (n = 7) and hyperechoic mucosal striations (n = 7) representing the most common findings. In total, 14 dogs received some form of treatment. The median survival time (MST) for all dogs was 279 days and the MST for the 14 dogs that received any treatment was 628 days. Dogs with anaemia and weight loss at presentation had significantly shorter survival times and dogs that received a combination of steroids and an alkylating agent had significantly longer survival times. Small cell, T-cell, intestinal lymphoma is a distinct disease process in dogs, and those undergoing treatment may experience prolonged survival.
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Affiliation(s)
- K M Couto
- Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California, Davis, California.,Vista Veterinary Specialists by Ethos Veterinary Health, Sacramento, California
| | - P F Moore
- Department of Pathology, Microbiology, & Immunology, School of Veterinary Medicine, University of California, Davis, California
| | - A L Zwingenberger
- Department of Surgical & Radiological Sciences, School of Veterinary Medicine, University of California, Davis, California
| | - J L Willcox
- Department of Surgical & Radiological Sciences, School of Veterinary Medicine, University of California, Davis, California
| | - K A Skorupski
- Department of Surgical & Radiological Sciences, School of Veterinary Medicine, University of California, Davis, California
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19
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Culp WTN, Zwingenberger AL, Giuffrida MA, Wisner ER, Hunt GB, Steffey MA, Mayhew PD, Marks SL. Prospective evaluation of outcome of dogs with intrahepatic portosystemic shunts treated via percutaneous transvenous coil embolization. Vet Surg 2017; 47:74-85. [PMID: 29064581 DOI: 10.1111/vsu.12732] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 05/04/2017] [Accepted: 06/22/2017] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To report outcome and complications after percutaneous transvenous coil embolization (PTCE) and evaluate the clinical, laboratory, and imaging changes in dogs with intrahepatic portosystemic shunts (IHPSS) pre-PTCE and post-PTCE. STUDY DESIGN Prospective clinical trial. ANIMALS Twenty-five dogs (15 dogs in imaging subgroup) with IHPSS. METHODS Clinical signs, hematologic, and biochemical parameters were recorded before and 3 months after PTCE. All dogs received the same medical treatment and underwent PTCE. In the imaging subgroup, ultrasonography, hepatic portal scintigraphy, and computed tomography-angiography were performed pre-PTCE and post-PTCE. RESULTS All evaluated bloodwork values improved by at least 50% of their initial value, by 3 months post-PTCE. Liver volume increased after PTCE (P = .001), but remained lower than normal in 11/15 dogs. Hepatic arterial fraction decreased after PTCE (P = .029), consistent with increased portal blood flow to the liver. Twenty-four of 25 dogs were available for reevaluation at 3 months, and all abnormal clinical signs had resolved in 22/24 dogs. CONCLUSION PTCE appears promising as a treatment for IHPSS, as clinical signs resolved in most cases, bloodwork abnormalities often normalized, and the procedure was performed safely with minimal complications. PTCE increased hepatic portal perfusion and liver volume in most dogs. These promising results justify a future randomized clinical trial comparing PTCE, other attenuation options, and medical management alone.
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Affiliation(s)
- William T N Culp
- Department of Surgical and Radiological Sciences, University of California-Davis, School of Veterinary Medicine, Davis, California
| | - Allison L Zwingenberger
- Department of Surgical and Radiological Sciences, University of California-Davis, School of Veterinary Medicine, Davis, California
| | - Michelle A Giuffrida
- Department of Surgical and Radiological Sciences, University of California-Davis, School of Veterinary Medicine, Davis, California
| | - Erik R Wisner
- Department of Surgical and Radiological Sciences, University of California-Davis, School of Veterinary Medicine, Davis, California
| | - Geraldine B Hunt
- Department of Surgical and Radiological Sciences, University of California-Davis, School of Veterinary Medicine, Davis, California
| | - Michele A Steffey
- Department of Surgical and Radiological Sciences, University of California-Davis, School of Veterinary Medicine, Davis, California
| | - Philipp D Mayhew
- Department of Surgical and Radiological Sciences, University of California-Davis, School of Veterinary Medicine, Davis, California
| | - Stanley L Marks
- Department of Medicine and Epidemiology, University of California-Davis, School of Veterinary Medicine, Davis, California
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20
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Mayhew PD, Culp WTN, Balsa IM, Zwingenberger AL. Phrenicoabdominal venotomy for tumor thrombectomy in dogs with adrenal neoplasia and suspected vena caval invasion. Vet Surg 2017; 47:227-235. [DOI: 10.1111/vsu.12728] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 05/04/2017] [Accepted: 06/22/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Philipp D. Mayhew
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine; University of California-Davis; Davis California
| | - William T. N. Culp
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine; University of California-Davis; Davis California
| | - Ingrid M. Balsa
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine; University of California-Davis; Davis California
| | - Allison L. Zwingenberger
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine; University of California-Davis; Davis California
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21
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Garcia TC, Steffey MA, Zwingenberger AL, Daniel L, Stover SM. CT-derived indices of canine osteosarcoma-affected antebrachial strength. Vet Surg 2017; 46:549-558. [DOI: 10.1111/vsu.12645] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 11/10/2016] [Accepted: 12/06/2016] [Indexed: 01/23/2023]
Affiliation(s)
- Tanya C. Garcia
- Department of Anatomy, Physiology and Cell Biology Surgical, School of Veterinary Medicine; University of California-Davis; Davis California
| | - Michele A. Steffey
- Department of Radiological Sciences, School of Veterinary Medicine; University of California-Davis; Davis California
| | - Allison L. Zwingenberger
- Department of Radiological Sciences, School of Veterinary Medicine; University of California-Davis; Davis California
| | - Leticia Daniel
- Department of Radiological Sciences, School of Veterinary Medicine; University of California-Davis; Davis California
| | - Susan M. Stover
- Department of Anatomy, Physiology and Cell Biology Surgical, School of Veterinary Medicine; University of California-Davis; Davis California
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22
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Steffey MA, Garcia TC, Daniel L, Zwingenberger AL, Stover SM. Mechanical properties of canine osteosarcoma-affected antebrachia. Vet Surg 2017; 46:539-548. [PMID: 28152185 DOI: 10.1111/vsu.12628] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 11/08/2016] [Indexed: 12/28/2022]
Abstract
OBJECTIVE To determine the influence of neoplasia on the biomechanical properties of canine antebrachia. STUDY DESIGN Ex vivo biomechanical study. SAMPLE POPULATION Osteosarcoma (OSA)-affected canine antebrachia (n = 12) and unaffected canine antebrachia (n = 9). METHODS Antebrachia were compressed in axial loading until failure. A load-deformation curve was used to acquire the structural mechanical properties of neoplastic and unaffected specimens. Structural properties and properties normalized by body weight (BW) and radius length were compared using analysis of variance (ANOVA). Modes of failure were compared descriptively. RESULTS Neoplastic antebrachia fractured at, or adjacent to, the OSA in the distal radial diaphysis. Unaffected antebrachia failed via mid-diaphyseal radial fractures with a transverse cranial component and an oblique caudal component. Structural mechanical properties were more variable in neoplastic antebrachia than unaffected antebrachia, which was partially attributable to differences in bone geometry related to dog size. When normalized by dog BW and radial length, strength, stiffness, and energy to yield and failure, were lower in neoplastic antebrachia than in unaffected antebrachia. CONCLUSIONS OSA of the distal radial metaphysis in dogs presented for limb amputation markedly compromises the structural integrity of affected antebrachia. However, biomechanical properties of affected bones was sufficient for weight-bearing, as none of the neoplastic antebrachia fractured before amputation. The behavior of tumor invaded bone under cyclic loading warrants further investigations to evaluate the viability of in situ therapies for bone tumors in dogs.
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Affiliation(s)
- Michele A Steffey
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, California
| | - Tanya C Garcia
- Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California-Davis, Davis, California
| | - Leticia Daniel
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, California
| | - Allison L Zwingenberger
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, California
| | - Susan M Stover
- Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California-Davis, Davis, California
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23
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Zwingenberger AL, Carrade Holt DD. Computed tomographic measurement of canine urine concentration. Can Vet J 2017; 58:180-182. [PMID: 28216688 PMCID: PMC5234318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Computed tomography (CT) is able to measure the attenuation of urine in Hounsfield units (HU) on abdominal imaging studies. This study was designed to measure the correlation of urine attenuation with urine specific gravity in urine samples of 40 dogs, providing a noninvasive measure of urine concentration. The HU of urine explained 72% of the variance in measured urine specific gravity [R2 = 0.72, F(1,38) = 95.55, P < 0.001]. This noninvasive measurement can be used to estimate urine concentration in dogs undergoing abdominal CT imaging.
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24
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Fouriez-Lablée V, Vergneau-Grosset C, Kass PH, Zwingenberger AL. COMPARISON BETWEEN THORACIC RADIOGRAPHIC FINDINGS AND POSTMORTEM DIAGNOSIS OF THORACIC DISEASES IN DYSPNEIC COMPANION RATS (RATTUS NORVEGICUS). Vet Radiol Ultrasound 2016; 58:133-143. [PMID: 27922210 PMCID: PMC7169294 DOI: 10.1111/vru.12459] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 10/16/2016] [Indexed: 11/30/2022] Open
Abstract
Companion rats are often presented to veterinarians for respiratory difficulties. Dyspnea in rats is most commonly due to infectious pneumonia, and thoracic neoplasia can go undiagnosed ante mortem due to a mistaken interpretation of pneumonia. In domestic carnivores, pulmonary nodular patterns have been shown to correlate with lung neoplastic diseases and infectious diseases. The main objective of this retrospective case series study was to determine whether certain radiographic criteria could be correlated with the presence of thoracic infectious disease and neoplastic disease in companion rats. A secondary objective was to determine whether the patient's sex and age were different between rats diagnosed with infectious versus neoplastic disease. Medical records and thoracic radiographs of dyspneic companion rats presented to the University of California at Davis, William R. Pritchard Veterinary Medical Teaching Hospital during the time period from January 2000 to December 2014 were reviewed. Rats with postmortem confirmation of thoracic lesions were included in the study. Thoracic radiographs were evaluated for positioning, lesion distribution, lung lobe involved, pulmonary pattern, mediastinal and pleural lesions by three observers blinded to diagnosis. Thirty rats were included in the study, including 23 rats with an infectious disease and seven with neoplasia. Mediastinal lesions were significantly more prevalent in the group diagnosed with thoracic neoplasia (P = 0.031), in particular cranially (P = 0.048). Although there was an overlap between the two groups, findings indicated that the presence of cranial mediastinal lesions may be helpful for differentiating neoplastic from infectious disease in rats.
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Affiliation(s)
- Virginie Fouriez-Lablée
- Medical Imaging Department, Alfort University Veterinary Hospital, National Veterinary School of Alfort, 94700, Maisons-Alfort, France
| | - Claire Vergneau-Grosset
- Departments of Medicine and Epidemiology, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616
| | - Philip H Kass
- Population Health and Reproduction, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616
| | - Allison L Zwingenberger
- Surgical and Radiologic Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA, 95616
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le Roux C, Cassel N, Fosgate GT, Zwingenberger AL, Kirberger RM. Computed tomographic findings of pulmonary atelectasis in healthy anesthetized Beagles. Am J Vet Res 2016; 77:1082-92. [DOI: 10.2460/ajvr.77.10.1082] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Steffey MA, Zwingenberger AL, Daniel L, Taylor SL. Assessment of 3 Bowel Preparation Protocols for Computed Tomography Pneumocolonography in Normal Dogs. Vet Surg 2016; 45:929-935. [PMID: 27489142 DOI: 10.1111/vsu.12524] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To investigate the effects of 3 different bowel preparation protocols on interpretation of computed tomography (CT) pneumocolonography images. STUDY DESIGN Experimental crossover design. ANIMALS Intact male, hound-cross, research colony dogs (n=4). METHODS All dogs received the 3 different bowel preparation protocols for CT pneumocolonography in the same order, with a minimum of 2 weeks between protocols. For each segment of large bowel, the subjective adequacy of bowel cleansing was assessed, residual fecal and bowel volumes were calculated, and the density of fecal material in the bowel lumen was measured. Linear mixed effect models that included a random dog effect were used to evaluate mean differences in outcome measures across protocols. RESULTS No dogs experienced any clinical problems associated with the protocols or CT pneumocolonography. Bowel cleansing was considered adequate for CT pneumocolonography interpretation for all 3 protocols. There was a significant effect of protocol on residual fecal volumes and the fecal:bowel volume ratio, with the 2 protocols that included an extended fast producing the lowest total residual fecal volumes. There was a significant effect of protocol on maximum measured density of residual fecal material with the 2 protocols including iodinated contrast having the highest density. CONCLUSIONS All protocols were sufficient for CT pneumocolonography interpretation and contrast-tagging of residual fecal material was successful with oral iopamidol administration. An at-home bowel cleansing protocol may provide adequate bowel cleansing for CT pneumocolonography image interpretation.
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Affiliation(s)
- Michele A Steffey
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, California.
| | - Allison L Zwingenberger
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, California
| | - Leticia Daniel
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, California
| | - Sandra L Taylor
- Department of Public Health Sciences, Division of Biostatistics, School of Medicine, University of California-Davis, Davis, California
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Hansen KS, Zwingenberger AL, Théon AP, Pfeiffer I, Kent MS. Treatment of MRI-Diagnosed Trigeminal Peripheral Nerve Sheath Tumors by Stereotactic Radiotherapy in Dogs. J Vet Intern Med 2016; 30:1112-20. [PMID: 27279132 PMCID: PMC5089643 DOI: 10.1111/jvim.13970] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 02/19/2016] [Accepted: 04/28/2016] [Indexed: 12/21/2022] Open
Abstract
Background Stereotactic radiotherapy (SRT) is an emerging technique for treating tumors in animals. Objectives To assess the outcome of dogs with suspected intracranial trigeminal nerve peripheral nerve sheath tumors (PNST) treated with SRT. Animals Eight dogs with presumptive PNST. Methods This was a retrospective study of dogs identified by searching UC Davis Veterinary Medical Teaching Hospital medical records for dogs treated with SRT for a presumed PNST. Presumptive diagnosis was based on magnetic resonance imaging. SRT was delivered in 3 dose fractions of 8 Gray (Gy) on consecutive days or every other day to a total dose of 24 Gy. Results Median disease‐specific survival was 745 days (range: 99–1375 days, n = 6). No signs of acute adverse effects of radiation treatment were recorded. Late radiation effects versus tumor progression could not be confirmed histopathologically because of few animals undergoing necropsy. Conclusions and Clinical Importance This study provides preliminary evidence that dogs with PNST benefit from SRT in terms of long‐term survival. The treatment appears to be well tolerated and requires fewer anesthetic events for animals compared to full‐course radiation.
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Affiliation(s)
- K S Hansen
- Department of Surgical and Radiological Sciences, UC Davis School of Veterinary Medicine, Davis, CA
| | - A L Zwingenberger
- Department of Surgical and Radiological Sciences, UC Davis School of Veterinary Medicine, Davis, CA
| | - A P Théon
- Department of Surgical and Radiological Sciences, UC Davis School of Veterinary Medicine, Davis, CA
| | - I Pfeiffer
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN
| | - M S Kent
- Department of Surgical and Radiological Sciences, UC Davis School of Veterinary Medicine, Davis, CA
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Tusler CA, Good KL, Maggs DJ, Zwingenberger AL, Reilly CM. Gross, histologic, and computed tomographic characterization of nonpathological intrascleral cartilage and bone in the domestic goat (Capra aegagrus hircus). Vet Ophthalmol 2016; 20:214-221. [DOI: 10.1111/vop.12391] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Charlotte A. Tusler
- Veterinary Medical Teaching Hospital; School of Veterinary Medicine; University of California; Davis CA 95616 USA
| | - Kathryn L. Good
- Department of Surgical & Radiological Sciences; School of Veterinary Medicine; University of California; Davis CA 95616 USA
| | - David J. Maggs
- Department of Surgical & Radiological Sciences; School of Veterinary Medicine; University of California; Davis CA 95616 USA
| | - Allison L. Zwingenberger
- Department of Surgical & Radiological Sciences; School of Veterinary Medicine; University of California; Davis CA 95616 USA
| | - Christopher M. Reilly
- Department of Pathology, Microbiology & Immunology; School of Veterinary Medicine; University of California; Davis CA 95616 USA
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Zwingenberger AL, Pollard RE, Taylor SL, Chen RX, Nunley J, Kent MS. Perfusion and Volume Response of Canine Brain Tumors to Stereotactic Radiosurgery and Radiotherapy. J Vet Intern Med 2016; 30:827-35. [PMID: 27149650 PMCID: PMC4867273 DOI: 10.1111/jvim.13945] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 02/03/2016] [Accepted: 03/10/2016] [Indexed: 12/26/2022] Open
Abstract
Background Stereotactic radiosurgery (SRS) and stereotactic radiotherapy (SRT) are highly conformal, high‐dose radiation treatment techniques used to treat people and dogs with brain tumors. Objectives To evaluate the response to SRS‐ and SRT‐treated tumors using volume and perfusion variables and to measure the survival times of affected dogs. Animals Prospective study of 34 dogs with evidence of brain tumors undergoing stereotactic radiosurgery (SRS) or stereotactic radiotherapy (SRT). Methods Computed tomography and MRI imaging were used to calculate tumor volume and perfusion at baseline, and at 3 months and 6 months after treatment. Survival analysis was performed to evaluate treatment efficacy. Results Mean tumor volume significantly declined from baseline to the first recheck by −0.826 cm3 (95% CI: −1.165, −0.487) (P < .001); this reduction was maintained at the second recheck. Blood flow and blood volume declined significantly in the tumor after treatment. Median survival was 324 days (95% CI: 292.8, 419.4), and 4 dogs survived longer than 650 days. Neither actual tumor volume (hazard ratio = 1.21, P = .19) nor the change in tumor volume from the baseline (hazard ratio = 1.38, P = .12) significantly affected the hazard of death because of the tumor. Conclusions and Clinical Importance Stereotactic radiosurgery and SRT are effective treatments for reducing tumor volume, blood flow, and blood volume. Treated dogs surviving for more than 1 year are more likely to die from other causes than of their primary brain tumor. SRS and SRT should be considered for noninvasive treatment of intracranial brain tumors.
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Affiliation(s)
- A L Zwingenberger
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA
| | - R E Pollard
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA
| | - S L Taylor
- Department of Public Health Sciences, School of Medicine, University of California, Davis, Sacramento, CA
| | - R X Chen
- Department of Public Health Sciences, School of Medicine, University of California, Davis, Sacramento, CA
| | - J Nunley
- William R. Pritchard Veterinary Teaching Hospital, School of Veterinary Medicine, University of California, Davis, CA
| | - M S Kent
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA
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Calicchio KW, Bennett RA, Laraio LC, Weisse C, Zwingenberger AL, Rosenthal KL, Johnston MS, Campbell VL, Solomon JA. Collateral circulation in ferrets (Mustela putorius) during temporary occlusion of the caudal vena cava. Am J Vet Res 2016; 77:540-7. [PMID: 27111022 DOI: 10.2460/ajvr.77.5.540] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine whether extent of collateral circulation would change during temporary occlusion of the caudal vena cava (CVC) in ferrets (Mustela putorius), a pressure change would occur caudal to the occlusion, and differences would exist between the sexes with respect to those changes. ANIMALS 8 adult ferrets (4 castrated males and 4 spayed females). PROCEDURES Ferrets were anesthetized. A balloon occlusion catheter was introduced through a jugular vein, passed into the CVC by use of fluoroscopy, positioned cranial to the right renal vein, and inflated for 20 minutes. Venography was performed 5 and 15 minutes after occlusion. Pressure in the CVC caudal to the occlusion was measured continuously. A CBC, plasma biochemical analysis, and urinalysis were performed immediately after the procedure and 2 or 3 days later. RESULTS All 8 ferrets survived the procedure; no differences were apparent between the sexes. Vessels providing collateral circulation were identified in all ferrets, indicating blood flow to the paravertebral venous plexus. Complications observed prior to occlusion included atrial and ventricular premature contractions. Complications after occlusion included bradycardia, seizures, and extravasation of contrast medium. Mean baseline CVC pressure was 5.4 cm H2O. During occlusion, 6 ferrets had a moderate increase in CVC pressure (mean, 24.3 cm H2O) and 2 ferrets had a marked increase in CVC pressure to > 55.0 cm H2O. CONCLUSIONS AND CLINICAL RELEVANCE Caval occlusion for 20 minutes was performed in healthy ferrets with minimal adverse effects noted within the follow-up period and no apparent differences between sexes. The CVC pressure during occlusion may be prognostic in ferrets undergoing surgical ligation of the CVC, which commonly occurs during adrenal tumor resection.
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Park SA, Taylor KT, Zwingenberger AL, Reilly CM, Toupadakis CA, Marfurt CF, Good KL, Murphy CJ. Gross anatomy and morphometric evaluation of the canine lacrimal and third eyelid glands. Vet Ophthalmol 2015; 19:230-6. [PMID: 26076886 DOI: 10.1111/vop.12288] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE The lacrimal gland (LG) and the third eyelid gland (TELG) are two intraorbital glands that, in dogs, secrete the aqueous component of the tear film. Despite the central importance of these structures for maintaining ocular surface health, the gross anatomy of the glands remains understudied. We investigated the macroscopic morphometric characteristics of the LG and TELG in three different dog breeds. PROCEDURES Twenty-six dog heads were dissected to expose the LG and TELG; the length, width, thickness, and weight of each were measured. During the dissections, the relationships between the glands and adjacent ocular structures and the blood and nerve supplies to the LG were photo-documented. RESULTS The LG had a flat and irregular shape with morphological variations among dogs. The LG was located on the dorsolateral aspect of the globe underneath the orbital ligament. The average length, width, and thickness (SEM) of the LG (mm) were 16.5 ± 0.7, 12.5 ± 0.4, and 2.7 ± 0.1 and of the TELG 10.5 ± 0.6, 11.0 ± 0.3, and 3.3 ± 0.1, respectively. The mean weights (SD) of the LG and TELG (mg) were 315.7 ± 21.1 and 263.3 ± 13.2, respectively. Beagles were observed to have significantly smaller LGs compared to pit bull terriers and pointer mixed-breed dogs. CONCLUSIONS The present study provides detailed normative anatomical and morphometric data for the LG and TELG. These data will aid researchers investigating alterations induced by disease states and should inform strategies for the local delivery of pharmacologic and cellular therapeutics.
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Affiliation(s)
- Shin Ae Park
- Veterinary Surgical and Radiological Sciences, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Ken T Taylor
- Department of Anatomy, Physiology and Cell Biology, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Allison L Zwingenberger
- Veterinary Surgical and Radiological Sciences, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Christopher M Reilly
- Department of Pathology, Microbiology and Immunology, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Chrisoula A Toupadakis
- Department of Anatomy, Physiology and Cell Biology, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Carl F Marfurt
- Department of Anatomy and Cell Biology, Indiana University School of Medicine-South Bend, South Bend, IN 95616, USA
| | - Kathryn L Good
- Veterinary Surgical and Radiological Sciences, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Christopher J Murphy
- Veterinary Surgical and Radiological Sciences, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA.,Department of Ophthalmology & Vision Science, School of Medicine, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
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Tong NM, Zwingenberger AL, Blair WH, Taylor SL, Chen RX, Sturges BK. Effect of screening abdominal ultrasound examination on the decision to pursue advanced diagnostic tests and treatment in dogs with neurologic disease. J Vet Intern Med 2015; 29:893-9. [PMID: 25900766 PMCID: PMC4895405 DOI: 10.1111/jvim.12602] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Revised: 02/03/2015] [Accepted: 03/24/2015] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Abdominal ultrasound examinations (AUS) are commonly performed before advanced neurodiagnostics to screen for diseases that might affect diagnostic plans and prognosis. OBJECTIVES Describe the type and frequency of abnormalities found by AUS in dogs presenting with a neurological condition, identify risk factors associated with abnormalities, and evaluate treatment decisions based on findings. ANIMALS Seven hundred and fifty-nine hospitalized dogs. METHODS Retrospective study. Medical records of dogs presented from 2007 to 2009 for neurologic disease were searched for signalment, neuroanatomic localization, and AUS findings. Whether dogs had advanced neurodiagnostics and treatment was analyzed. RESULTS Fifty-eight percent of dogs had abnormal findings on AUS. Probability of abnormalities increased with age (P < 0.001). Nondachshund breeds had higher probability of abnormal AUS than dachshunds (odds ratio [OR] = 1.87). Eleven percent of dogs did not have advanced neurodiagnostics and in 1.3%, this was because of abnormal AUS. Dogs with ultrasonographic abnormalities were less likely than dogs without to have advanced neurodiagnostics (OR = 0.3 [95% confidence interval [CI]: 0.17, 0.52]), however, the probability of performing advanced diagnostics was high regardless of normal (OR = 0.95 [95% CI: 0.92, 0.97]) or abnormal (OR = 0.85 [95% CI: 0.81, 0.88]) AUS. Treatment was more often pursued in small dogs and less often in dogs with brain disease. CONCLUSIONS AND CLINICAL IMPORTANCE Findings from screening AUS had a small negative effect on the likelihood of pursuing advanced neurodiagnostics. Although it should be included in the extracranial diagnostic workup in dogs with significant history or physical examination abnormalities, AUS is considered a low-yield diagnostic test in young dogs and dachshunds.
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Affiliation(s)
- N M Tong
- William R. Pritchard Veterinary Medical Teaching Hospital, University of California School of Veterinary Medicine, Davis, CA
| | - A L Zwingenberger
- Department of Surgical and Radiological Sciences, University of California School of Veterinary Medicine, Davis, CA
| | - W H Blair
- William R. Pritchard Veterinary Medical Teaching Hospital, University of California School of Veterinary Medicine, Davis, CA
| | - S L Taylor
- Clinical and Translational Science Center, School of Medicine, University of California, Sacramento, CA
| | - R X Chen
- Clinical and Translational Science Center, School of Medicine, University of California, Sacramento, CA
| | - B K Sturges
- Department of Surgical and Radiological Sciences, University of California School of Veterinary Medicine, Davis, CA
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Mai W, Seiler GS, Lindl-bylicki BJ, Zwingenberger AL. CT AND MRI FEATURES OF CAROTID BODY PARAGANGLIOMAS IN 16 DOGS. Vet Radiol Ultrasound 2015; 56:374-83. [DOI: 10.1111/vru.12254] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 01/14/2015] [Indexed: 11/27/2022] Open
Affiliation(s)
- Wilfried Mai
- Department of Clinical Studies, Section of Radiology, University of Pennsylvania School of Veterinary Medicine; Philadelphia PA 19104
| | - Gabriela S. Seiler
- Department of Molecular Biomedical Sciences, North Carolina State University College of Veterinary Medicine; Raleigh NC 27607
| | - Britany J. Lindl-bylicki
- William H. Pritchard Veterinary Medical Teaching Hospital; University of California-Davis; Davis CA 95616
| | - Allison L. Zwingenberger
- Department of Surgical and Radiological Sciences; University of California-Davis; Davis CA 95616
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Steffey MA, Daniel L, Taylor SL, Chen RX, Zwingenberger AL. Computed tomographic pneumocolonography in normal dogs. Vet Radiol Ultrasound 2014; 56:278-85. [PMID: 25545308 DOI: 10.1111/vru.12235] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2014] [Accepted: 11/04/2014] [Indexed: 01/22/2023] Open
Abstract
Objectives of this prospective study were to describe effects of varying technical components that may contribute to an optimal protocol for computed tomographic pneumocolonography (CTP) in dogs, and to develop a standardized methodology for CTP as a future potential diagnostic tool in canine clinical patients with large bowel disease. Eight purpose-bred intact male hound cross-research dogs were enrolled and randomized to groups based on variables of pressure/body position (n = 4) and insufflation time (n = 4). For each segment of large bowel (rectum, colorectal junction, descending colon, transverse colon, ascending colon), the adequacy of bowel preparation, % of bowel lumen filled with fecal material, and bowel tortuosity or folding were assessed. Measurements of bowel wall thickness (cm), cross-sectional bowel lumen diameter (cm), and cross-sectional bowel luminal area (cm(2) ) were obtained at standardized locations within the large bowel. False discovery rates (FDR) were calculated to adjust for multiple testing. Values of FDR < 0.05 were considered significant. Differences in mean cross-sectional area and diameter and bowel wall thickness under increasing pressure were not significant after adjusting for multiple testing; some had raw p values <0.05. Ascending colon diameter and ascending colon area significantly increased with insufflation time (FDR < 0.05). No other response variables showed a significant change with insufflation time. The optimal insufflation pressure for maintaining pneumocolon in this study was determined to be 20 mmHg. CTP is a feasible technique to provide consistent distension for imaging of the large bowel and further study on application of CTP in clinical patients is warranted.
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Affiliation(s)
- Michele A Steffey
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California-Davis, Davis, CA, 95615
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Zwingenberger AL, Park SA, Murphy CJ. Computed tomographic imaging characteristics of the normal canine lacrimal glands. BMC Vet Res 2014; 10:116. [PMID: 24886364 PMCID: PMC4038083 DOI: 10.1186/1746-6148-10-116] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Accepted: 05/01/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The canine lacrimal gland (LG) and accessory lacrimal gland of the third eyelid (TEG) are responsible for production of the aqueous portion of the precorneal tear film. Immune-mediated, toxic, neoplastic, or infectious processes can affect the glands directly or can involve adjacent tissues, with secondary gland involvement. Disease affecting these glands can cause keratoconjunctivitis sicca, corneal ulcers, and loss of vision. Due to their location in the orbit, these small structures are difficult to evaluate and measure, making cross-sectional imaging an important diagnostic tool. The detailed cross-sectional imaging appearance of the LG and TEG in dogs using computed tomography (CT) has not been reported to date. RESULTS Forty-two dogs were imaged, and the length, width, and height were measured and the volume calculated for the LGs & TEGs. The glands were best visualized in contrast-enhanced CT images. The mean volume of the LG was 0.14 cm3 and the TEG was 0.1 cm3. The mean height, width, and length of the LG were, 9.36 mm, 4.29 mm, and 9.35 mm, respectively; the corresponding values for the TEG was 2.02 mm, 9.34 mm, and 7.90 mm. LG and TEG volume were positively correlated with body weight (p < 0.05). CONCLUSIONS Contrast-enhanced CT is a valuable tool for noninvasive assessment of canine lacrimal glands.
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Affiliation(s)
- Allison L Zwingenberger
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, Davis, CA 95616, USA.
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Zwingenberger AL, Daniel L, Steffey MA, Mayhew PD, Mayhew KN, Culp WTN, Hunt GB. Correlation Between Liver Volume, Portal Vascular Anatomy, and Hepatic Perfusion in Dogs With Congenital Portosystemic Shunt Before and After Placement of Ameroid Constrictors. Vet Surg 2014; 43:926-34. [DOI: 10.1111/j.1532-950x.2014.12193.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2013] [Accepted: 11/01/2013] [Indexed: 12/21/2022]
Affiliation(s)
- Allison L. Zwingenberger
- Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California, Davis; Davis California
| | - Leticia Daniel
- Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California, Davis; Davis California
| | - Michele A. Steffey
- Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California, Davis; Davis California
| | - Philipp D. Mayhew
- Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California, Davis; Davis California
| | - Kelli N. Mayhew
- Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California, Davis; Davis California
| | - William T. N. Culp
- Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California, Davis; Davis California
| | - Geraldine B. Hunt
- Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California, Davis; Davis California
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Ryan CT, Glass EN, Seiler G, Zwingenberger AL, Mai W. MAGNETIC RESONANCE IMAGING FINDINGS ASSOCIATED WITH LATERAL CEREBRAL VENTRICULOMEGALY IN ENGLISH BULLDOGS. Vet Radiol Ultrasound 2013; 55:292-9. [DOI: 10.1111/vru.12123] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Accepted: 09/10/2013] [Indexed: 11/26/2022] Open
Affiliation(s)
- Christopher T. Ryan
- Section of Radiology; Department of Clinical Studies School of Veterinary Medicine; University of Pennsylvania; Philadelphia PA 19104
| | | | - Gabriela Seiler
- Department of Molecular Biomedical Sciences; College of Veterinary Medicine; North Carolina State University; Raleigh NC 27607
| | - Allison L. Zwingenberger
- Department of Surgical and Radiological Sciences; College of Veterinary Medicine; University of California; Davis CA 95616
| | - Wilfried Mai
- Section of Radiology; Department of Clinical Studies School of Veterinary Medicine; University of Pennsylvania; Philadelphia PA 19104
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Mendoza P, d'Anjou MA, Carmel EN, Fournier E, Mai W, Alexander K, Winter MD, Zwingenberger AL, Thrall DE, Theoret C. Validation of a novel technique for creating simulated radiographs using computed tomography datasets. Vet Radiol Ultrasound 2013; 55:251-62. [PMID: 24219133 DOI: 10.1111/vru.12117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2013] [Accepted: 08/04/2013] [Indexed: 11/29/2022] Open
Abstract
Understanding radiographic anatomy and the effects of varying patient and radiographic tube positioning on image quality can be a challenge for students. The purposes of this study were to develop and validate a novel technique for creating simulated radiographs using computed tomography (CT) datasets. A DICOM viewer (ORS Visual) plug-in was developed with the ability to move and deform cuboidal volumetric CT datasets, and to produce images simulating the effects of tube-patient-detector distance and angulation. Computed tomographic datasets were acquired from two dogs, one cat, and one horse. Simulated radiographs of different body parts (n = 9) were produced using different angles to mimic conventional projections, before actual digital radiographs were obtained using the same projections. These studies (n = 18) were then submitted to 10 board-certified radiologists who were asked to score visualization of anatomical landmarks, depiction of patient positioning, realism of distortion/magnification, and image quality. No significant differences between simulated and actual radiographs were found for anatomic structure visualization and patient positioning in the majority of body parts. For the assessment of radiographic realism, no significant differences were found between simulated and digital radiographs for canine pelvis, equine tarsus, and feline abdomen body parts. Overall, image quality and contrast resolution of simulated radiographs were considered satisfactory. Findings from the current study indicated that radiographs simulated using this new technique are comparable to actual digital radiographs. Further studies are needed to apply this technique in developing interactive tools for teaching radiographic anatomy and the effects of varying patient and tube positioning.
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Affiliation(s)
- Patricia Mendoza
- Départements des sciences cliniques, Faculté de médecine vétérinaire, Université de Montréal, Saint-Hyacinthe, QC, Canada
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Park SA, Reilly CM, Wood JA, Chung DJ, Carrade DD, Deremer SL, Seraphin RL, Clark KC, Zwingenberger AL, Borjesson DL, Hayashi K, Russell P, Murphy CJ. Safety and immunomodulatory effects of allogeneic canine adipose-derived mesenchymal stromal cells transplanted into the region of the lacrimal gland, the gland of the third eyelid and the knee joint. Cytotherapy 2013; 15:1498-510. [PMID: 23992828 DOI: 10.1016/j.jcyt.2013.06.009] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Revised: 06/14/2013] [Accepted: 06/19/2013] [Indexed: 12/14/2022]
Abstract
BACKGROUND AIMS Mesenchymal stromal cells (MSCs) have been extensively studied as a cellular therapeutic for various pathologic conditions. However, there remains a paucity of data regarding regional and systemic safety of MSC transplantations, particularly with multiple deliveries of allogeneic cells. The purpose of this study was to investigate the safety and systemic immunomodulatory effects of repeated local delivery of allogeneic MSCs into the region of the lacrimal gland, the gland of the third eyelid and the knee joint in dogs. METHODS Allogeneic adipose tissue-derived canine MSCs were delivered to the regions of the lacrimal gland and the third eyelid gland as well as in the knee joints of six healthy laboratory beagles as follows: six times with 1-week intervals for delivery to the lacrimal gland and the third eyelid gland regions and three to four times with 1- to 2-week intervals for intra-articular transplantations. Dogs were sequentially evaluated by clinical examination. At the conclusion of the study, dogs were humanely euthanized, and a complete gross and histopathologic examination of all organ systems was performed. Mixed leukocyte reactions were also performed before the first transplantation and after the final transplantation. RESULTS Clinical and pathologic examinations found no severe consequences after repeated MSC transplantations. Results of mixed leukocyte reactions demonstrated suppression of T-cell proliferation after MSC transplantations. CONCLUSIONS This is the first study to demonstrate regional and systemic safety and systemic immunomodulatory effects of repeated local delivery of allogeneic MSCs in vivo.
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Affiliation(s)
- Shin Ae Park
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, California, USA
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Daniaux LA, Laurenson MP, Marks SL, Moore PF, Taylor SL, Chen RX, Zwingenberger AL. Ultrasonographic thickening of the muscularis propria in feline small intestinal small cell T-cell lymphoma and inflammatory bowel disease. J Feline Med Surg 2013; 16:89-98. [PMID: 23900499 DOI: 10.1177/1098612x13498596] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Gastrointestinal lymphoma is the most common form of lymphoma in the cat. More recently, an ultrasonographic pattern associated with feline small cell T-cell gastrointestinal lymphoma has been recognized as a diffuse thickening of the muscularis propria of the small intestine. This pattern is also described with feline inflammatory bowel disease. To evaluate the similarities between the diseases, we quantified the thickness of the muscularis propria layer in the duodenum, jejunum and ileum of 14 cats affected by small cell T-cell lymphoma and inflammatory bowel disease (IBD) and 19 healthy cats. We found a significantly increased thickness of the muscularis propria in cats with lymphoma and IBD compared with healthy cats. The mean thickness of the muscularis propria in cats with lymphoma or IBD was twice the thickness of that of healthy cats, and was the major contributor to significant overall bowel wall thickening in the duodenum and jejunum. A muscularis to submucosa ratio >1 is indicative of an abnormal bowel segment. Colic lymph nodes in cats with lymphoma were increased in size compared with healthy cats. In cats with gastrointestinal lymphoma and histologic transmural infiltration of the small intestines, colic or jejunal lymph nodes were rounded, increased in size and hypoechoic.
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Affiliation(s)
- Lise A Daniaux
- 1William R Pritchard Veterinary Medical Teaching Hospital, University of California, Davis, CA, USA
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Reetz JA, Caceres AV, Suran JN, Oura TJ, Zwingenberger AL, Mai W. Sensitivity, positive predictive value, and interobserver variability of computed tomography in the diagnosis of bullae associated with spontaneous pneumothorax in dogs: 19 cases (2003–2012). J Am Vet Med Assoc 2013; 243:244-51. [DOI: 10.2460/javma.243.2.244] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Zwingenberger AL, Vernau W, Sh C, Yan W, Chen X, Gordon IK, Kent MS. Corrigendum to “Development and characterization of 5 canine B-cell lymphoma cell lines” [Leuk. Res. 36(5) (2011) 601–606]. Leuk Res 2013. [DOI: 10.1016/j.leukres.2012.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Kelly KR, Kapatkin AR, Zwingenberger AL, Christe KL. Efficacy of antibiotic-impregnated polymethylmethacrylate beads in a rhesus macaque (Macaca mulatta) with osteomyelitis. Comp Med 2012; 62:311-315. [PMID: 23043785 PMCID: PMC3415374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 12/03/2011] [Accepted: 02/04/2012] [Indexed: 06/01/2023]
Abstract
Here we describe the successful surgical implementation of antibiotic-impregnated polymethylmethacrylate beads in a rhesus macaque (Macaca mulatta) with marked osteomyelitis. The macaque presented to the veterinary clinic with grossly contaminated bite wounds in the left ankle secondary to conspecific trauma. Radiographic findings were highly suggestive of osteomyelitis. Additional differential diagnoses included bony infarct, fracture, and cellulitis. In light of the location of the lesion and extensive tissue trauma, the animal had a poor prognosis. Systemic, broad-spectrum antibiotics were instituted. After 2 wk of care, lesions did not respond to empirical therapies. On consultation, a veterinary orthopedic surgeon at another facility recommended placement of antibiotic-impregnated polymethylmethacrylate beads at the sites of osteomyelitis. The animal underwent minor surgery in which beads were introduced into the wound. The monkey had a positive response to therapy. The animal regained full function and was returned to outdoor social housing. Veterinarians are encouraged to consider using antibiotic-impregnated polymethylmethacrylate beads when treating osteomyelitis in other nonhuman primates and in other traditional laboratory animal species.
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Affiliation(s)
- Kristi R Kelly
- Department of Primate Medicine, California National Primate Research Center, University of California-Davis, Davis, California, USA.
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Zwingenberger AL, Kent MS, Liu R, Kukis DL, Wisner ER, DeNardo SJ, Taylor SL, Chen X, Lam KS. In-vivo biodistribution and safety of 99mTc-LLP2A-HYNIC in canine non-Hodgkin lymphoma. PLoS One 2012; 7:e34404. [PMID: 22545083 PMCID: PMC3335845 DOI: 10.1371/journal.pone.0034404] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Accepted: 02/27/2012] [Indexed: 12/28/2022] Open
Abstract
Theranostic agents are critical for improving the diagnosis and treatment of non-Hodgkin Lymphoma (NHL). The peptidomimetic LLP2A is a novel peptide receptor radiotherapy candidate for treating NHL that expresses the activated α4β1 integrin. Tumor-bearing dogs are an excellent model of human NHL with similar clinical characteristics, behavior, and compressed clinical course. Canine in vivo imaging studies will provide valuable biodistribution and affinity information that reflects a diverse clinical population of lymphoma. This may also help to determine potential dose-limiting radiotoxicity to organs in human clinical trials. To validate this construct in a naturally occurring model of NHL, we performed in-vivo molecular targeted imaging and biodistribution in 3 normal dogs and 5 NHL bearing dogs. 99mTc-LLP2A-HYNIC-PEG and 99mTc-LLP2A-HYNIC were successfully synthesized and had very good labeling efficiency and radiochemical purity. 99mTc-LLP2A-HYNIC and 99mTc-LLP2A-HYNIC-PEG had biodistribution in keeping with their molecular size, with 99mTc-LLP2A-HYNIC-PEG remaining longer in the circulation, having higher tissue uptake, and having more activity in the liver compared to 99mTc-LLP2A-HYNIC. 99mTc-LLP2A-HYNIC was mainly eliminated through the kidneys with some residual activity. Radioactivity was reduced to near-background levels at 6 hours after injection. In NHL dogs, tumor showed moderately increased activity over background, with tumor activity in B-cell lymphoma dogs decreasing after chemotherapy. This compound is promising in the development of targeted drug-delivery radiopharmaceuticals and may contribute to translational work in people affected by non-Hodgkin lymphoma.
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Affiliation(s)
- Allison L Zwingenberger
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, California, United States of America.
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Cannon MS, Paglia D, Zwingenberger AL, Boroffka SAEB, Hollingsworth SR, Wisner ER. Clinical and diagnostic imaging findings in dogs with zygomatic sialadenitis: 11 cases (1990-2009). J Am Vet Med Assoc 2012; 239:1211-8. [PMID: 21999794 DOI: 10.2460/javma.239.9.1211] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To describe clinical and diagnostic imaging features of zygomatic sialadenitis in dogs. DESIGN Retrospective case series. ANIMALS 11 dogs with zygomatic sialadenitis and 20 control dogs without evidence of retrobulbar disease. PROCEDURES Medical records were searched for dogs with zygomatic sialadenitis that underwent some combination of magnetic resonance imaging (MRI), computed tomography (CT), and ultrasonography. Signalment, clinical signs, results of clinicopathologic tests, cytologic and histologic diagnosis, treatment, qualitative disease features, and disease course were recorded. Images obtained via MRI or CT were analyzed for pre- and postcontrast signal intensity or density, respectively; zygomatic salivary gland area was determined. Results were compared with those of control dogs that underwent the same imaging procedures (n = 10/method). Ultrasonographic images of affected dogs were assessed qualitatively. RESULTS Most (9/11) affected dogs were medium- or large-breed males (mean age, 8 years) with unilateral disease. Affected dogs had clinical signs of retrobulbar disease and cytologic or histologic evidence of zygomatic sialadenitis. Sialoceles were detected in 7 affected glands. Compared with values for control dogs, MRI findings in affected dogs (n = 7) included gland enlargement, T1-weighted hypointensity, T2-weighted hyperintensity, and increased contrast enhancement; CT features in affected dogs (2) included gland enlargement and hypodensity on unenhanced images. Retrobulbar masses were identified via ultrasonography in 9 of 10 orbits examined, and zygomatic salivary gland origin was detected in 4. CONCLUSIONS AND CLINICAL RELEVANCE Visualization of anatomic structures for diagnosis of zygomatic sialadenitis and evaluation of adjacent structures was excellent via MRI and CT Ultrasonography was less definitive but useful for sample collection.
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Affiliation(s)
- Matthew S Cannon
- Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California-Davis, 95616, USA.
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Wood JA, Chung DJ, Park SA, Zwingenberger AL, Reilly CM, Ly I, Walker NJ, Vernau W, Hayashi K, Wisner ER, Cannon MS, Kass PH, Cherry SR, Borjesson DL, Russell P, Murphy CJ. Periocular and intra-articular injection of canine adipose-derived mesenchymal stem cells: an in vivo imaging and migration study. J Ocul Pharmacol Ther 2011; 28:307-17. [PMID: 22175793 DOI: 10.1089/jop.2011.0166] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
PURPOSE Immune-mediated diseases affect millions of people worldwide with an economic impact measured in the billions of dollars. Mesenchymal stem cells (MSCs) are being investigated in the treatment of certain immune mediated diseases, but their application in the treatment of the majority of these disorders remains largely unexplored. Keratoconjunctivitis sicca can occur as a result of progressive immune-mediated destruction of lacrimal tissue in dogs and humans, and immune-mediated joint disease is common to both species. In dogs, allogeneic MSC engraftment and migration have yet to be investigated in vivo in the context of repeated injections. METHODS With these aims in mind, the engraftment of allogeneic canine MSCs after an injection into the periocular and intra-articular regions was followed in vivo using magnetic resonance and fluorescent imaging. RESULTS The cells were shown to be resident near the site of the injection for a minimum of 2 weeks. Analysis of 61 tissues demonstrated preferential migration and subsequent engraftment of MSCs in the thymus as well as the gastrointestinal tract. These results also detail a novel in vivo imaging technique and demonstrate the differential spatial distribution of MSCs after migration away from the sites of local delivery. CONCLUSION The active engraftment of the MSCs in combination with their previously documented immunomodulatory capabilities suggests the potential for therapeutic benefit in using MSCs for the treatment of periocular and joint diseases with immune involvement.
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Affiliation(s)
- Joshua A Wood
- Department of Surgical and Radiological Sciences, University of California, Davis, California 95616, USA
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Zwingenberger AL, Bouma JL, Saunders HM, Nodine CF. Expert interpretation compensates for reduced image quality of camera-digitized images referred to radiologists. Vet Radiol Ultrasound 2011; 52:591-5. [PMID: 21831251 DOI: 10.1111/j.1740-8261.2011.01836.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
We compared the accuracy of five veterinary radiologists when reading 20 radiographic cases on both analog film and in camera-digitized format. In addition, we compared the ability of five veterinary radiologists vs. 10 private practice veterinarians to interpret the analog images. Interpretation accuracy was compared using receiver operating characteristic curve analysis. Veterinary radiologists' accuracy did not significantly differ between analog vs. camera-digitized images (P = 0.13) although sensitivity was higher for analog images. Radiologists' interpretation of both digital and analog images was significantly better compared with the private veterinarians (P < 0.05).
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Affiliation(s)
- Allison L Zwingenberger
- Matthew J. Ryan Department of Clinical Studies, Veterinary Hospital, University of Pennsylvania, Philadelphia, PA 19104, USA.
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Aina OH, Maeda Y, Harrison M, Zwingenberger AL, Walker NJ, Lam KS, Kent MS. Canine malignant melanoma alpha-3 integrin binding peptides. Vet Immunol Immunopathol 2011; 143:11-9. [PMID: 21722969 DOI: 10.1016/j.vetimm.2011.05.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2011] [Revised: 05/09/2011] [Accepted: 05/11/2011] [Indexed: 11/24/2022]
Abstract
There is a need to develop novel targeted imaging and therapeutic agents that can aid in early diagnosis, detection of metastasis and treatment of melanoma. Alpha-3 integrin is overexpressed in 82% of metastatic melanomas in humans and may be a potential target for peptide ligands carrying therapeutic agents. Five melanoma cell lines were generated from canine primary oral and metastatic canine tumors, grown in mice, and validated with melanoma markers Melan A, S-100, Micropthalmia transcription factor (MITF), Tyrosinase, and MART-1. The melanoma cell lines were tested for binding affinity to previously published alpha-3 integrin-binding peptides containing the cdGXGXXc motif. Fluorescent conjugates of the alpha-3 integrin binding OA02 peptide were used to quantify receptor affinity in the cell lines, a specimen of canine primary oral melanoma, and melanoma xenografts. Alpha-3 integrin was expressed by all 5 canine melanoma cell lines. Four of the 5 lines as well as the primary canine tumor showed affinity to alpha-3 integrin binding peptides with the cdGXGXXc motif. Optical imaging of canine melanoma xenografts in nude mice indicates rapid, strong uptake of the optical tracer in the tumor with an average persistence of approximately 48 h. Ex vivo images showed high tumor-to-background ratio, with tumor signals more than twice that of the kidney and other vital organs. We propose that integrin alpha-3 integrin binding ligands could potentially become useful probes for imaging and delivery of cytotoxic agents for the treatment of melanoma.
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Affiliation(s)
- Olulanu H Aina
- Division of Hematology & Oncology, Department of Internal Medicine, UCD Cancer Center, University of California Davis, Sacramento, CA 95817, USA
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Abstract
Severe portal vascular anomalies have been reported previously accompanying azygos continuation of the caudal vena cava, polysplenia, and situs anomalies in dogs and people. Three dogs with portal vascular anomalies were identified by means of CT angiography as having portal vein aplasia with portal insertion into the caudal vena cava, azygos continuation of the caudal vena cava, and interruption of the pre-hepatic caudal vena cava. This information confirms that complex embryological defects may occur in patients presenting for congenital portosystemic shunt, and that CT angiography is a non-invasive method of completely evaluating these potentially non-surgical portal vascular anomalies.
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Affiliation(s)
- Allison L Zwingenberger
- Department of Surgery and Radiological Sciences, School of Veterinary Medicine, 2112 Tupper Hall, University of California, Davis, CA 95616, USA.
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