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Radosta L. Behavior Changes Associated with Metabolic Disease of Dogs and Cats. Vet Clin North Am Small Anim Pract 2024; 54:17-28. [PMID: 37734960 DOI: 10.1016/j.cvsm.2023.08.004] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
Like many physical disorders, the clinical signs associated with metabolic diseases affecting thyroid, adrenal, and pancreatic function are reflective of nonspecific changes in behavior. Additionally, patients who have underlying disorders associated with fear, anxiety, stress, conflict, and/or panic may be under treatment with medications that alter basal thyroid, glucose, and cortisol levels. Through reinforcement and punishment of behaviors associated with clinical signs caused by organic or iatrogenic endocrine disease, behaviors can be perpetuated and become persistent patterns. Screening all patients presenting with a primary behavior complaint or those with behavioral clinical signs of endocrine diseases is essential. Alleviating stress immediately while working up or treating metabolic disease reduces suffering and may stave off the adoption of behavior patterns more permanently.
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Affiliation(s)
- Lisa Radosta
- Florida Veterinary Behavior Service, West Palm Beach, FL, USA.
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Mayor C, Verdés J, Alomar J, Novellas R, Pumarola M, Añor S. Intracranial Granular Cell Tumours in Three Dogs: Atypical Magnetic Resonance Imaging Features and Immunohistochemical Study. Vet Sci 2023; 10. [PMID: 36851438 DOI: 10.3390/vetsci10020134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 02/06/2023] [Accepted: 02/07/2023] [Indexed: 02/11/2023] Open
Abstract
Intracranial granular cell tumours (GCT) are uncommon neoplasms of uncertain cellular origin that are rarely reported in dogs. This case series describes three aged dogs that presented with neurological signs in which magnetic resonance (MR) imaging revealed plaquelike extra-axial lesions that were hypointense on T2-weighted (T2w) images. The surgical biopsy of the lesions and necropsies were followed by histochemical characterisation with periodic acid-Schiff (PAS) staining and immunohistochemistry with ubiquitin, S-100, and SOX-10 to elucidate the cellular origin. The immunohistochemical study indicated that these intracranial GCTs were not of Schwann cell origin. In conclusion, GCTs should be considered a differential diagnosis of intracranial, extra-axial hypointense brain lesions on T2w MR images.
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Reineking W, Seehusen F, Lehmbecker A, Wohlsein P. Predominance of Granular Cell Tumours among Testicular Tumours of Rabbits (Oryctolagus cuniculi f. dom.). J Comp Pathol 2019; 173:24-29. [PMID: 31812170 DOI: 10.1016/j.jcpa.2019.09.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 09/17/2019] [Accepted: 09/25/2019] [Indexed: 11/19/2022]
Abstract
Testicular neoplasms are reported rarely in pet and laboratory rabbits (Oryctolagus cuniculi f. dom.), with interstitial cell tumours being the most commonly described testicular neoplasm. In this retrospective study, paraffin wax-embedded testicles with neoplastic changes from 52 rabbits were investigated. Five out of 52 animals exhibited more than one tumour type, resulting in a total of 57 tumours. Granular cell tumours were the most prevalent neoplasm with 36 examples (63%) out of the 57 testicular tumours. Interstitial cell tumours, Sertoli cell tumours and seminomas occurred less frequently. Granular cell tumours of the testis are rare in rabbits. Histological similarities between granular cell and interstitial cell (Leydig cell) tumours in haematoxylin and eosin-stained tissue sections may lead to misdiagnoses. The periodic acid-Schiff reaction or immunohistochemistry for periaxin and S100 protein, as well as ultrastructural analysis, are useful methods to confirm the diagnosis.
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Affiliation(s)
- W Reineking
- Department of Pathology, University of Veterinary Medicine, Hannover, Germany
| | - F Seehusen
- Department of Pathology, University of Veterinary Medicine, Hannover, Germany
| | - A Lehmbecker
- Department of Pathology, University of Veterinary Medicine, Hannover, Germany
| | - P Wohlsein
- Department of Pathology, University of Veterinary Medicine, Hannover, Germany.
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Dimov D, Dikov T, Dimitrova L, Filipov C, Raychev I. First report of canine mammary gland granular cell tumour: case description and review of the literature. BJVM 2019. [DOI: 10.15547/bjvm.2111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The case of a 5-year-old intact female Pitbull Terrier with a granular cell tumour (GCT) of the mammary gland is presented. The dog was admitted for surgical removal of a non-painful lump assumed to be a fibroadenoma. Histological and immunohistochemical findings leading to the diagnosis consisted of polygonal tumour cells with well-defined cell borders and granular cytoplasm, staining positively with neuron-specific enolase (NSE) and protein S100 and negatively for cytokeratin AE1-AE3. Some important points in the diagnostic and therapeutic approach to this uncommon neoplasm are discussed. To our best knowledge this is the first case of such tumour in the mammary gland described in the veterinary literature.
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Bolfa P, DellaGrotte L, Weronko T, Armien AG. Cutaneous epithelioid hemangiosarcoma with granular cell differentiation in a dog: a case report and review of the literature. J Vet Diagn Invest 2018; 30:951-954. [PMID: 30136913 DOI: 10.1177/1040638718794785] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We report a case of cutaneous epithelioid hemangiosarcoma in a dog in which the majority of the neoplastic cells displayed histologic and ultrastructural features similar to those seen in granular cell tumors (GCTs). This intersection of hemangiosarcoma and granular cell change adds to the argument that GCTs are heterogeneous in histologic origin and underlines the fact that pathologists should not consider all GCTs as a single entity. The combination of histology in typical areas of the tumor with ultrastructural changes and the correct immunohistochemical markers can facilitate the accurate diagnosis of tumors with granular cell differentiation. Besides characteristic intracytoplasmic PAS-positive granules and ultrastructural proteinaceous accumulation within single membrane vesicles (presumably lysosomes and phagolysosomes), we suggest the following combination of markers for the diagnosis of granular cell angiosarcoma and/or hemangiosarcoma: vimentin positive, NSE and/or S100 negative, CD31 positive. We propose that the histologic granular appearance represents a metabolic defect of the neoplastic cells, which supports variability in cell origin for granular cell differentiation.
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Affiliation(s)
- Pompei Bolfa
- Departments of Biomedical Sciences (Bolfa, DellaGrotte), Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies.,Clinical Sciences (Weronko), Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies.,Ultrastructural Pathology Unit, Veterinary Diagnostic Laboratory, University of Minnesota, St. Paul, MN (Armien)
| | - Lusan DellaGrotte
- Departments of Biomedical Sciences (Bolfa, DellaGrotte), Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies.,Clinical Sciences (Weronko), Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies.,Ultrastructural Pathology Unit, Veterinary Diagnostic Laboratory, University of Minnesota, St. Paul, MN (Armien)
| | - Teri Weronko
- Departments of Biomedical Sciences (Bolfa, DellaGrotte), Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies.,Clinical Sciences (Weronko), Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies.,Ultrastructural Pathology Unit, Veterinary Diagnostic Laboratory, University of Minnesota, St. Paul, MN (Armien)
| | - Anibal G Armien
- Departments of Biomedical Sciences (Bolfa, DellaGrotte), Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies.,Clinical Sciences (Weronko), Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies.,Ultrastructural Pathology Unit, Veterinary Diagnostic Laboratory, University of Minnesota, St. Paul, MN (Armien)
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Valentini A, Canal S, Mandara MT, Balducci F, Bernardini M. Intradural extramedullary granular cell tumour in a cat. J Small Anim Pract 2018; 61:259-262. [PMID: 29745421 DOI: 10.1111/jsap.12854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 11/24/2017] [Accepted: 01/08/2018] [Indexed: 11/27/2022]
Abstract
A 7-year-old domestic shorthair cat was evaluated for progressive paraparesis, inability to jump, a paralysed tail and inability to void the bladder. Neurologic examination was consistent with a L4-S3 localisation. Survey radiographs of the lumbar vertebral column revealed L4-L7 vertebral body remodelling. A pre-contrast T1-weighted hyperintense, diffusely enhancing intradural lesion extending from L4 to S1 vertebral bodies was detected by MRI. Large, mesenchymal, round-to-polygonal cells arranged in nests or sheets were found on histologic examination at post mortem. These cells were characterised by abundant intracytoplasmic PAS-positive, diastase-resistant granules and positive immunoexpression of vimentin, S-100, neuron-specific enolase and desmin. This is the first report of a spinal granular cell tumour in a cat.
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Affiliation(s)
- A Valentini
- Department of Animal Medicine, Production and Health, University of Padova, 35020 Legnaro, Italy
| | - S Canal
- Neurology Unit, Portoni Rossi Veterinary Hospital, 40069 Zola Predosa, Italy
| | - M T Mandara
- Department of Veterinary Medicine, University of Perugia, 06126 Perugia, Italy
| | - F Balducci
- Neurology Unit, Portoni Rossi Veterinary Hospital, 40069 Zola Predosa, Italy
| | - M Bernardini
- Department of Animal Medicine, Production and Health, University of Padova, 35020 Legnaro, Italy.,Neurology Unit, Portoni Rossi Veterinary Hospital, 40069 Zola Predosa, Italy
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Abstract
Multiple subcutaneous masses from two sibling bearded dragons were removed. Nodules were well demarcated, restricted to the subcutis, and soft, white to yellow, resembling adipose tissue. Histologically, the masses were composed of short interlacing streams and bundles of spindle cells, with regions of vague nuclear palisading. Two of the tumors contained a subpopulation of polygonal cells with abundant periodic acid-Schiff (PAS)-positive cytoplasmic granules. Neoplastic cells were immunohistochemically positive for S100 and neuron-specific enolase (NSE) but negative for desmin and smooth muscle actin. Electron microscopy and reticulin stains demonstrated a continuous basal lamina separating intertwining cells. Histologic, ultrastructural, and immunohistochemical features were consistent with a peripheral nerve sheath origin. At 1 year postexcision, local reoccurrence of a single incompletely excised mass from the left shoulder was noted.
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Affiliation(s)
- K Y Lemberger
- University of Illinois Zoological Pathology Program, Loyola University Medical Center, Room 0745, Building 101, 2160 South First Avenue, Maywood, IL 60153, USA.
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Abstract
Cardiac mesothelioma with granular cell features was diagnosed in a 10-year-old Golden Retriever presenting with pericardial and abdominal effusions. The diagnosis was based on gross, morphologic, and immunohistochemical features. The immunohistochemical profile of the neoplasm was pancytokeratin positive, vimentin positive, and S-100 negative; most gross and morphologic features were consistent with both mesothelioma and granular cell tumor. To the authors' knowledge, the prognosis for either primary cardiac mesothelioma or granular cell tumor in the dog is unknown. At 4 months after thoracotomy, pericardectomy, and mass excision, this dog was alive and without clinical evidence of pericardial or abdominal effusions. We describe a granular morphologic variant of cardiac mesothelioma in a dog.
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Affiliation(s)
- A Brower
- Department of Pathobiological Sciences, University of Wisconsin Veterinary Medical Teaching Hospital and Wisconsin, Veterinary Diagnostic Laboratory, 6101 Mineral Point Rd, Madison, WI, 53705, USA.
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Anwer CC, Vernau KM, Higgins RJ, Dickinson PJ, Sturges BK, LeCouteur RA, Bentley RT, Wisner ER. MAGNETIC RESONANCE IMAGING FEATURES OF INTRACRANIAL GRANULAR CELL TUMORS IN SIX DOGS. Vet Radiol Ultrasound 2013; 54:271-7. [DOI: 10.1111/vru.12027] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Accepted: 02/07/2013] [Indexed: 12/01/2022] Open
Affiliation(s)
- Cona C. Anwer
- From the Department of Surgical and Radiological Sciences
| | | | - Robert J. Higgins
- Department of Pathology; Microbiology, and Immunology; University of California - Davis; Davis; CA
| | | | | | | | | | - Erik R. Wisner
- From the Department of Surgical and Radiological Sciences
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Spoor MS, Kim DY, Kanazono S, Wininger FA, Whitney MS. What is your diagnosis? Impression smears of a cerebral mass from a dog. Vet Clin Pathol 2013; 42:240-1. [PMID: 23432620 DOI: 10.1111/vcp.12026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Melanie S Spoor
- Department of Pathobiology, Veterinary Medical Diagnostic Laboratory, University of Missouri, Columbia, MO 65211, USA.
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Hernández V, Carrera E, Méndez A, Morales JC, Morales E, Sánchez FD. Histopathologic, immunohistochemical and ultrastructural features of a granular cell tumour in an Australian parakeet (Melopsittacus undulatus). Avian Pathol 2012; 41:437-40. [DOI: 10.1080/03079457.2012.711463] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Abstract
A 10-year-old, female spayed Chihuahua dog was presented to the Veterinary Teaching Hospital at the University of Georgia for evaluation of seizures, abnormal mentation, and cervical pain of 2 months duration. On magnetic resonance imaging, there was generalized thickening of the meninges overlying the left cerebral hemisphere and along the falx cerebri. Despite symptomatic treatment, the dog remained neurologically affected. Consequently, the owners elected euthanasia. On gross examination, the meninges covering the left cerebral hemisphere were severely thickened and firmly adhered to the calvaria. On transverse section, the white matter of the left cerebral hemisphere was swollen, enlarged, and extended across the midline with resultant compression of the right cerebral hemisphere. Cytologic evaluation of an impression smear of the thickened meninges showed numerous large, spindloid to polygonal cells with abundant, amphophilic, vacuolated cytoplasm, present either in clusters or in individual cells. Histopathologic evaluation of the meninges revealed a poorly circumscribed and infiltrative, moderately cellular neoplasm, composed of vacuolated, spindloid to polygonal cells with marked anisocytosis and anisokaryosis, arranged in sheets, and occasionally separated by thick bands of connective tissue. Immunohistochemistry for vimentin revealed diffuse cytoplasmic staining of the neoplastic cells. Although the periodic acid–Schiff reaction was negative, ultrastructural findings showed numerous vesicles that were empty or that contained membranous or electron-dense material. Based on gross, microscopic, immunohistochemical, and ultrastructural changes, the meningeal neoplasm was diagnosed as an atypical granular cell tumor.
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Affiliation(s)
- Sasmita Mishra
- Departments of Pathology (Mishra, Sakamoto), College of Veterinary Medicine, University of Georgia, Athens, GA
- Small Animal Medicine and Surgery (Kent, Haley, Platt), College of Veterinary Medicine, University of Georgia, Athens, GA
| | - Marc Kent
- Departments of Pathology (Mishra, Sakamoto), College of Veterinary Medicine, University of Georgia, Athens, GA
- Small Animal Medicine and Surgery (Kent, Haley, Platt), College of Veterinary Medicine, University of Georgia, Athens, GA
| | - Allison Haley
- Departments of Pathology (Mishra, Sakamoto), College of Veterinary Medicine, University of Georgia, Athens, GA
- Small Animal Medicine and Surgery (Kent, Haley, Platt), College of Veterinary Medicine, University of Georgia, Athens, GA
| | - Simon Platt
- Departments of Pathology (Mishra, Sakamoto), College of Veterinary Medicine, University of Georgia, Athens, GA
- Small Animal Medicine and Surgery (Kent, Haley, Platt), College of Veterinary Medicine, University of Georgia, Athens, GA
| | - Kaori Sakamoto
- Departments of Pathology (Mishra, Sakamoto), College of Veterinary Medicine, University of Georgia, Athens, GA
- Small Animal Medicine and Surgery (Kent, Haley, Platt), College of Veterinary Medicine, University of Georgia, Athens, GA
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Abstract
A 2-year-old Great Dane dog with a 2.5-week history of progressive paraparesis was presented to the Veterinary Medical Teaching Hospital at the University of Wisconsin-Madison. Neurologic examination revealed nonambulatory paraparesis with reduced to absent withdrawal hind-limb reflexes and lumbar pain. Magnetic resonance imaging and gross pathology confirmed a larger regional lumbar mass and a second smaller extradural mass within the spinal canal. The left lumbar mass was associated with extensive hemorrhage; dissection showed a dark-red, soft, well-circumscribed mass measuring 2 cm × 1.5 cm × 0.5 cm within the left fourth lumbar spinal nerve. Histopathological evaluation with immunohistochemistry revealed sheets of round to polygonal cells with diffuse granular cytoplasm demonstrating diastase-resistant periodic acid–Schiff reactivity and positive immunoexpression of S100 and neuron-specific enolase. The smaller extradural mass within the spinal canal exhibited similar morphology. Based on gross, histological, and immunohistochemical evidence, the masses were diagnosed as granular cell tumor.
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Affiliation(s)
- Deepa Rao
- Veterinary Medical Teaching Hospital, University of Wisconsin, Madison, WI
- Cellular and Molecular Pathology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC
| | - Helena Rylander
- Veterinary Medical Teaching Hospital, University of Wisconsin, Madison, WI
| | - Randi Drees
- Veterinary Medical Teaching Hospital, University of Wisconsin, Madison, WI
| | - Tobias Schwarz
- Veterinary Medical Teaching Hospital, University of Wisconsin, Madison, WI
- University of Edinburgh, Royal School of Veterinary Studies, Roslin, UK
| | - Howard Steinberg
- Veterinary Medical Teaching Hospital, University of Wisconsin, Madison, WI
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Veit AC, Painter JT, Miller RA, Hardisty JF, Dixon D. Characterization of uterine granular cell tumors in B6C3F1 mice: a histomorphologic, immunohistochemical, and ultrastructural study. Vet Pathol 2008; 45:654-62. [PMID: 18725470 DOI: 10.1354/vp.45-5-654] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The granular cell tumor is most often a benign neoplasm of uncertain origin. Four uterine granular cell tumors in control and treated female B6C3F1 mice were identified in chronic studies at the National Toxicology Program. Two tumors occurred in untreated control animals and 2 in treated animals receiving different compounds. Tissue sections were evaluated histologically and stained with hematoxylin and eosin, periodic acid-Schiff with diastase resistance, Masson's trichrome, toluidine blue, phosphotungstic acid-hematoxylin, and stained immunohistochemically with a panel of antibodies to muscle (desmin, alpha smooth muscle actin), neural (S-100, neuron specific enolase), epithelial (wide-spectrum cytokeratin), and macrophage (F4/80) markers. The main histomorphologic feature of tumor cells was the presence of abundant cytoplasmic eosinophilic granules that stained positive for periodic acid-Schiff with diastase resistance. Tumors varied in appearance and were comprised of sheets and nests of round to polygonal cells with distinct borders. Nuclei were hyperchromatic, pleomorphic, and centrally to eccentrically located and often contained single nucleoli. Occasional multinucleated giant cells were observed. Tumors were pale pink and homogeneous with trichrome stain and negative with toluidine blue. Three tumors had positive to weakly positive immunoreactivity for desmin, and 1 was positive for alpha smooth muscle actin. Expression of S-100, wide-spectrum cytokeratin, and neuron-specific enolase was negative for all tumors. Ultrastructurally, prominent electron-dense cytoplasmic granules were abundant and contained secondary lysosomes with heterogeneous lysosomal contents. The characteristics of these uterine granular cell tumors were suggestive of a myogenic origin.
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Affiliation(s)
- A C Veit
- Cellular and Molecular Pathology Branch, National Institute of Environmental Health Sciences, PO Box 12233, MD C2-09, 111 T.W. Alexander Drive, Bldg. 101, Research Triangle Park, NC 27709 (USA)
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Abstract
A 12-year-old female miniature poodle showed a 3-month history of neurological signs. Magnetic resonance imaging disclosed a high intensity tumor mass in the right cerebral hemisphere with compression of the lateral ventricle. At necropsy, a 2 x 3 cm white, friable mass was found in the right ventral pyriform lobe. Microscopically, the tumor cells were large, polygonal to round cells supported by a sparse fibrovascular stroma. The tumor cells typically possessed finely granular, pale eosinophilic cytoplasm with strongly positive periodic acid-Schiff (PAS) reaction. The tumor cells were immunopositive for vimentin, NSE and S-100. Ultrastructurally, the tumor cells showed large amounts of granules in the cytoplasm, and absence of basement membrane. Based on the above-mentioned findings, the intracranial granular cell tumor was diagnosed.
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Affiliation(s)
- Chen-Hsuan Liu
- Department of Veterinary Medicine, National Taiwan University, Taipei 106, Taiwan, ROC
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Abstract
Pituitary apoplexy is a syndrome which has been described in humans caused by acute haemorrhage or infarction within a pituitary tumour or a non-tumorous pituitary gland. This report describes the authors' observations of a dog in which vomiting, visual disturbances, seizures, altered consciousness and diencephalic dysfunction occurred in association with haemorrhage originating from a pituitary macroadenoma. The clinical signs were thought to be consistent with disruption of the hypothalamus and brainstem, together with raised intracranial pressure due to intraventricular haemorrhage. These signs, and the pathological findings, bear a striking resemblance to those associated with the syndrome of pituitary apoplexy, seen in humans.
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Affiliation(s)
- S N Long
- Department of Veterinary Clinical Studies, University of Glasgow Veterinary School, Bearsden Road, Bearsden, Glasgow G61 1QH
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Abstract
OBJECTIVE To evaluate progesterone and estrogen receptor expression in meningiomas of the CNS in dogs and cats. ANIMAL 8 dogs (1 of which was treated with gestrinone) and 5 cats with intracranial meningiomas and 2 dogs with spinal cord meningiomas; tissue samples were also obtained from 1 clinically normal dog and 1 clinically normal cat. PROCEDURE Meningioma tissue was obtained during surgery or at necropsy; samples were processed for histologic classification and immunohistochemical evaluation of the proportion of tumor cells with progesterone and estrogen receptors. Correlation among receptor expression, tumor grade, and histologic subtypes was determined. RESULT Several histologic subtypes of intracranial meningiomas were detected among tissue samples. In the cats, all intracranial meningiomas were benign. Progesterone receptor immunoreactivity was detected in 14 of 15 meningiomas. Progesterone receptor expression was identified in > 80% of cells in 8 intracranial meningiomas (4 dogs and 4 cats) and 2 spinal cord meningiomas. In samples of malignant transitional and granular cell meningiomas in dogs, progesterone receptors were detected in 32 and 4.8% of cells respectively. In 1 cat, 38% of tumor cells had progesterone receptors. In a dog treated with gestrinone, no progesterone receptors were detected in the intracranial meningioma. Estrogen receptors were only detected in the tumor of 1 dog. CONCLUSIONS AND CLINICAL RELEVANCE Results indicate a high proportion of progesterone receptors in cells of meningiomas of the CNS in dogs and cats. Antiprogesterone treatment may have a role in the treatment of unresectable or recurrent meningiomas in dogs and cats.
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Affiliation(s)
- P Filippo Adamo
- Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI 53706, USA
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