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Sidhu A, DeJesus AA. Computed tomographic, magnetic resonance imaging, and ultrasonographic characteristics of retrobulbar meningiomas in 15 dogs. Vet Radiol Ultrasound 2023; 64:1044-1054. [PMID: 38009278 DOI: 10.1111/vru.13311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 09/26/2023] [Accepted: 09/27/2023] [Indexed: 11/28/2023] Open
Abstract
Meningioma is the most common tumor of the cranium in dogs and an important differential diagnosis for a potentially treatable disease that can be found in the periorbital tissues. The objective of this retrospective, case series study was to describe the CT, MRI, and US characteristics of confirmed retrobulbar meningiomas in a group of dogs. Medical records from multiple institutions were searched for canine patients with CT, MRI, and/or US imaging of a cytologically or histologically confirmed retrobulbar meningioma. Fifteen dogs met the inclusion criteria. Retrobulbar meningiomas typically appeared as a relatively well-defined conical to ovoid mass within the retrobulbar space, most often along the optic nerve and expanding the extraocular muscle cone. On CT, masses were predominantly soft tissue attenuating and variably heterogeneously contrast enhancing. While MRI features were variable, moderate to marked contrast enhancement was seen in all cases. Many of the tumors had evidence of partial mineralization, best appreciated on CT in nine patients, but also suspected based on susceptibility artifacts in three MRI cases, one of which was confirmed on CT. Regional osteolysis was a rare finding, noted in three cases, but was often accompanied by cranial cavity extension (2/3). Cranial cavity extension was also seen in the absence of regional osteolysis, identified in a total of six patients. On US, masses were echogenic and compressed the globe. The findings were consistent with previous gross and histologic descriptions and supported prioritizing retrobulbar meningioma as a differential diagnosis for dogs with the described imaging characteristics.
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Affiliation(s)
- Amit Sidhu
- Department of Diagnostic Imaging, The Animal Medical Center, New York, New York, USA
| | - Antonia A DeJesus
- Department of Diagnostic Imaging, The Animal Medical Center, New York, New York, USA
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2
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Flaherty EH, Robinson NA, Pizzirani S, Pumphrey SA. Evaluation of cytology and histopathology for the diagnosis of canine orbital neoplasia: 112 cases (2004-2019) and review of the literature. Vet Ophthalmol 2019; 23:259-268. [PMID: 31693288 DOI: 10.1111/vop.12717] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 09/03/2019] [Accepted: 10/05/2019] [Indexed: 12/28/2022]
Abstract
OBJECTIVE To provide an updated overview of canine orbital neoplasia, to compare diagnostic utility of cytology and histopathology, and to evaluate alternative sampling modalities, particularly image-guided core needle biopsy. PROCEDURES A medical records search was performed to identify dogs with orbital neoplasia. Data were collected regarding signalment, diagnosis, vision status, imaging modalities, and sample collection methods. A reference population with orbital neoplasia was also identified via literature search for comparison with regard to final diagnosis. RESULTS One hundred and twelve dogs met selection criteria. In the study and reference populations, respectively, diagnoses were grouped as follows: mesenchymal tumors 40% and 35%, epithelial tumors 35% and 18%, tumors of neural origin 8% and 37%, and round cell 17% and 10%. The most common diagnoses in the study group were nasal adenocarcinoma, osteosarcoma, lymphoma, and meningioma. Cytology results were available for 47 dogs and histopathology results were available for 95 dogs. Both cytology and histopathology results were available for 30 dogs, in 53% of which results were discordant. Cytology samples were nondiagnostic or provided a diagnosis that was later overturned in 32% of cases in which they were obtained. Results from core needle biopsy samples were nondiagnostic or overturned by surgical biopsy results in only 13% of cases. No significant complications were associated with any sampling method. CONCLUSIONS Orbital neoplasia is common in dogs. Histopathology is superior to cytology in providing a definitive diagnosis. Image-guided core needle biopsy appears to be a safe and effective means of obtaining samples.
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Affiliation(s)
- Edward H Flaherty
- University of Pennsylvania, School of Veterinary Medicine, Philadelphia, Pennsylvania
| | - Nicholas A Robinson
- Department of Biomedical Sciences, Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts
| | - Stefano Pizzirani
- Department of Clinical Sciences, Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts
| | - Stephanie A Pumphrey
- Department of Clinical Sciences, Cummings School of Veterinary Medicine, Tufts University, North Grafton, Massachusetts
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3
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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. BULGARIAN JOURNAL OF VETERINARY MEDICINE 2019. [DOI: 10.15547/bjvm.2111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [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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Plesker R, Bleyer M, Mätz-Rensing K. Spontaneous meningioma in a pig-tailed macaque ( Macaca nemestrina). Primate Biol 2018; 5:7-13. [PMID: 32110712 PMCID: PMC7041523 DOI: 10.5194/pb-5-7-2018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 03/12/2018] [Indexed: 12/02/2022] Open
Abstract
We present a case of spontaneous meningioma in a female pig-tailed macaque (Macaca nemestrina) more than 24 years old. Clinically, the monkey displayed slow, weak, and insecure movements and poor vision. A tumorous mass was present at the floor of the cranial vault extending from the optic chiasm towards the foramen magnum. It compressed adjacent parts of the brain, infiltrated the sphenoidal and occipital bone, and showed transcranial expansion into the pharyngeal area. Histologically, the tumor was consistent with a meningioma displaying mostly meningothelial and some microcystic components. Since only six cases of meningiomas in nonhuman primates have been reported so far and only two of these meningiomas have been described in detail, the findings of each case should be reported to expand the knowledge base of this type of tumor. In addition, this is the first description of a meningioma in pig-tailed macaques.
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Affiliation(s)
| | - Martina Bleyer
- Pathology Unit, German Primate Center, Göttingen, 37077, Germany
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Abstract
This study describes the prevalence and distribution of 42 cases of skull base neoplasia in dogs between 2000 and 2014. The average age of affected individuals was 9.5 years, and there was no sex or breed predisposition. The most common skull base neoplasms were meningioma (25 cases) and pituitary adenoma (9 cases). Less common tumors included craniopharyngioma (2 cases), nerve sheath tumor (2 cases), and 1 case each of pituitary carcinoma, meningeal oligodendrogliomatosis, presumed nasal or sinonasal carcinoma, and multilobular tumor of bone. All neoplasms caused some degree of compression of adjacent structures. The distribution of the tumors was greatest in the sellar region ( n = 18), followed by the paranasal region ( n = 12), caudal cranial fossa ( n = 10), central cranial fossa ( n = 1), and rostral cranial fossa ( n = 1).
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Affiliation(s)
- Daniel R. Rissi
- Department of Pathology and Athens Veterinary Diagnostic Laboratory, College of Veterinary Medicine, The University of Georgia, Athens, GA
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6
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McDonald JE, Knollinger AM, Dees DD. Ventral transpalpebral anterior orbitotomy: surgical description and report of 3 cases. Vet Ophthalmol 2015; 19:81-9. [DOI: 10.1111/vop.12278] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Darryl D. Dees
- Eye Care for Animals; 12419 Metric Blvd Austin TX 78758 USA
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7
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Labelle AL, Labelle P. Canine ocular neoplasia: a review. Vet Ophthalmol 2013; 16 Suppl 1:3-14. [DOI: 10.1111/vop.12062] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2013] [Revised: 04/09/2013] [Accepted: 04/25/2013] [Indexed: 11/29/2022]
Affiliation(s)
- Amber L. Labelle
- Department of Veterinary Clinical Medicine; University of Illinois Urbana-Champaign; 1008 W. Hazelwood Drive Urbana IL 61802 USA
| | - Philippe Labelle
- Antech Diagnostics; 1111 Marcus Avenue Lake Success NY 11042 USA
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Motta L, Mandara MT, Skerritt GC. Canine and feline intracranial meningiomas: An updated review. Vet J 2012; 192:153-65. [DOI: 10.1016/j.tvjl.2011.10.008] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 10/10/2011] [Accepted: 10/11/2011] [Indexed: 12/24/2022]
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9
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Labelle P, Reilly CM, Naydan DK, Labelle AL. Immunohistochemical Characteristics of Normal Canine Eyes. Vet Pathol 2011; 49:860-9. [DOI: 10.1177/0300985811427152] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Immunohistochemistry is widely utilized in diagnostic laboratories to study neoplastic and nonneoplastic diseases. Knowledge of the immunohistochemical characteristics of normal tissue is essential for interpretation of immunoreactivity in pathologic conditions. In this study, immunohistochemistry was performed with a broad panel of diagnostically relevant antibodies on 4 normal canine globes—namely, vimentin, pan-cytokeratin (AE1/AE3), cytokeratin 7, cytokeratin 8/18, cytokeratin 20, α–smooth muscle actin, muscle specific actin, desmin, Melan-A, microphthalmia transcription factor, S-100, glial fibrillary acidic protein, triple neurofilaments, neuron-specific enolase, chromogranin A, synaptophysin, laminin and CD31. Results include cytokeratin immunoreactivity limited to the conjunctival epithelium, corneal epithelium, and retinal pigment epithelium; distinct patterns of immunopositivity of muscle markers; and widespread immunoreactivity for vimentin and most neural/neuroendocrine markers. These findings in normal eyes provide the basis for interpretation of ocular immunohistochemistry in dogs. Published immunophenotypes of primary ocular neoplasms are also reviewed.
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Affiliation(s)
- P. Labelle
- Antech Diagnostics, Lake Success, New York
| | - C. M. Reilly
- Department of Pathology, Microbiology, and Immunology, University of California–Davis, Davis, California
| | - D. K. Naydan
- Department of Pathology, Microbiology, and Immunology, University of California–Davis, Davis, California
| | - A. L. Labelle
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois–Urbana-Champaign, Urbana, Illinois
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Welihozkiy A, Pirie CG, Pizzirani S. Scleral and suprachoroidal foreign body in a dog--a case report. Vet Ophthalmol 2011; 14:345-51. [PMID: 21929614 DOI: 10.1111/j.1463-5224.2011.00922.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A 2-year-old male castrated Springer Spaniel with a 3-week history of waxing and waning right sided exophthalmos, periorbital swelling, chemosis, and fundic changes was examined. Ophthalmic examination of the right eye revealed slight chemosis and nictitating membrane protrusion. Indirect ophthalmoscopy showed an approximately 8 mm peripapillary hyporeflective tapetal lesion with subretinal edema consistent with a bulbar/retrobulbar disease process. Inflammatory or neoplastic diseases were the main differential diagnoses. Ancillary diagnostics (ocular ultrasound and computed tomography) showed a focal, poorly defined dense tissue involving the caudomedial aspect of the right globe, adjacent to the optic nerve head without apparent orbital involvement. Considering the duration, location, and severity of the clinical findings, enucleation of the right globe was performed. Histopathology revealed focal thickening of the posterior wall with severe pyogranulomatous inflammation, surrounding a foreign body most consistent with plant material embedded between the sclera and the choroid (suprachoroidal). This report describes a rare case of a scleral/suprachoroidal foreign body (plant material), and outlines the difficulty of establishing an etiological diagnosis using standard ocular imaging.
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Affiliation(s)
- Anja Welihozkiy
- Department of Clinical Sciences, Cummings School of Veterinary Medicine, Tufts University, North Grafton, MA 01536, USA
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Regan DP, Kent M, Mathes R, Almy FS, Moore PA, Howerth EW. Clinicopathologic findings in a dog with a retrobulbar meningioma. J Vet Diagn Invest 2011; 23:857-62. [DOI: 10.1177/1040638711408280] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
An 11-year-old Fox Terrier dog was evaluated for a 10-month history of progressive exophthalmia and visual deficits in the right eye. Ophthalmologic examination revealed severe corneal fibrosis and pigmentation, which obscured examination of the anterior chamber of the right eye. There was decreased retropulsion of the right eye. Neurological examination revealed an absent menace response bilaterally. Pupillary light reflex was normal in the left eye. Due to the corneal pathology, pupillary light reflex was unable to be evaluated in the right eye. A retrobulbar mass with heterogeneous echotexture was identified using ultrasonography. Cytological evaluation of a fine-needle aspirate of the mass disclosed a neoplastic cell population consisting of round to polygonal cells with lightly basophilic to gray cytoplasm and round to ovoid nuclei having a coarse granular chromatin pattern. Magnetic resonance imaging disclosed a right-sided retrobulbar mass that extended through the optic canal and was contiguous with an extra-axial mass in the ventral right rostral and middle cranial fossae. The mass displayed homogenous and strong contrast enhancement. Following exenteration, histological examination of the retrobulbar mass was consistent with meningioma. Immunohistochemically, tumor cells stained positive for vimentin (cytoplasmic) and E-cadherin (membranous), and negative for S100, pancytokeratin, and cytokeratins AE1 and AE3.
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Affiliation(s)
- Daniel P. Regan
- Departments of Small Animal Medicine and Surgery (Regan, Kent, Mathes, Moore)
- Pathology (Almy, Howerth), College of Veterinary Medicine, University of Georgia, Athens, GA
| | - Marc Kent
- Departments of Small Animal Medicine and Surgery (Regan, Kent, Mathes, Moore)
- Pathology (Almy, Howerth), College of Veterinary Medicine, University of Georgia, Athens, GA
| | - Rachael Mathes
- Departments of Small Animal Medicine and Surgery (Regan, Kent, Mathes, Moore)
- Pathology (Almy, Howerth), College of Veterinary Medicine, University of Georgia, Athens, GA
| | - Frederic S. Almy
- Departments of Small Animal Medicine and Surgery (Regan, Kent, Mathes, Moore)
- Pathology (Almy, Howerth), College of Veterinary Medicine, University of Georgia, Athens, GA
| | - Phillip A. Moore
- Departments of Small Animal Medicine and Surgery (Regan, Kent, Mathes, Moore)
- Pathology (Almy, Howerth), College of Veterinary Medicine, University of Georgia, Athens, GA
| | - Elizabeth W. Howerth
- Departments of Small Animal Medicine and Surgery (Regan, Kent, Mathes, Moore)
- Pathology (Almy, Howerth), College of Veterinary Medicine, University of Georgia, Athens, GA
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12
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Weber K, Garman RH, Germann PG, Hardisty JF, Krinke G, Millar P, Pardo ID. Classification of Neural Tumors in Laboratory Rodents, Emphasizing the Rat. Toxicol Pathol 2010; 39:129-51. [DOI: 10.1177/0192623310392249] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Neoplasms of the nervous system, whether spontaneous or induced, are infrequent in laboratory rodents and very rare in other laboratory animal species. The morphology of neural tumors depends on the intrinsic functions and properties of the cell type, the interactions between the neoplasm and surrounding normal tissue, and regressive changes. The incidence of neural neoplasms varies with sex, location, and age of tumor onset. Although the onset of spontaneous tumor development cannot be established in routine oncogenicity studies, calculations using the time of diagnosis (day of death) have revealed significant differences in tumor biology among different rat strains. In the central nervous system, granular cell tumors (a meningioma variant), followed by glial tumors, are the most common neoplasms in rats, whereas glial cell tumors are observed most frequently in mice. Central nervous system tumors usually affect the brain rather than the spinal cord. Other than adrenal gland pheochromocytomas, the most common neoplasms of the peripheral nervous system are schwannomas. Neural tumors may develop in the central nervous system and peripheral nervous system from other cell lineages (including extraneural elements like adipose tissue and lymphocytes), but such lesions are very rare in laboratory animals.
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Affiliation(s)
- Klaus Weber
- Department of Pathology, Harlan Laboratories Ltd., Itingen, Switzerland
| | | | | | - Jerry F. Hardisty
- EPL Experimental Pathology Laboratories, Inc., Research Triangle Park, NC, USA
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13
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Barnes LD, Pearce JW, Berent LM, Fox DB, Giuliano EA. Surgical management of orbital nodular granulomatous episcleritis in a dog. Vet Ophthalmol 2010; 13:251-8. [PMID: 20618804 DOI: 10.1111/j.1463-5224.2010.00781.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A 27 kg, 6-year-old, male castrated German shorthaired pointer presented to the University of Missouri, Veterinary Teaching Hospital with the complaint of progressive exophthalmia of 2 years duration optical density (OD). Lack of retropulsion OD was noted on physical examination. Anterior segment examination OU and fundic examination OS did not reveal any abnormalities. Examination of the fundus OD revealed focal scleral indentation of the inferior nasal globe. The indentation changed location with globe movement OD. MRI and CT scan revealed a well-circumscribed, approximately 2 cm in diameter mass located caudal and ventral to the affected globe that appeared to communicate with the nictitating membrane with absence of any bony involvement. A modified lateral orbitotomy was recommended and performed to remove the orbital mass and nictitating membrane en-bloc. Histopathology and immunohistochemistry of the mass confirmed a diagnosis of nodular granulomatous episcleritis (NGE). Postoperatively, the dog developed absolute keratoconjunctivitis sicca (KCS). Examples of primary episcleral inflammation in the dog include diffuse episcleritis, NGE, nodular fasciitis, fibrous histiocytoma, proliferative conjunctivitis/keratoconjunctivitis, pseudotumor, and Collie granuloma. The etiology of these episcleral inflammations is presumed to be immune mediated. To our knowledge, this is the first report of NGE affecting the orbital region of a dog. Development of absolute KCS resulting from excision of the nictitating membrane is also supported by this case.
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Affiliation(s)
- Laura D Barnes
- College of Veterinary Medicine, University of Missouri, Columbia, MO 65211, USA
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Ramos-Vara JA, Miller MA, Gilbreath E, Patterson JS. Immunohistochemical Detection of CD34, E-cadherin, Claudin-1, Glucose Transporter 1, Laminin, and Protein Gene Product 9.5 in 28 Canine and 8 Feline Meningiomas. Vet Pathol 2010; 47:725-37. [DOI: 10.1177/0300985810364528] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The variation in histologic pattern of meningiomas can make their diagnosis challenging. The immunohistochemical profile of 28 canine and 8 feline meningiomas was examined. Tumor types included anaplastic (6 dogs), angiomatoid (1 cat), fibroblastic (3 dogs, 1 cat), meningothelial (1 dog), microcystic (2 dogs), myxoid (3 dogs), psammomatous (4 cats), and transitional (13 dogs, 2 cats). The authors compared the expression of novel markers (CD34, E-cadherin, claudin-1, glucose transporter 1 [GLUT-1], laminin, and protein gene product [PGP] 9.5) with published markers (cytokeratins, glial fibrillary acidic protein [GFAP], progesterone receptor, S100, and vimentin). Neoplastic cells were immunohistochemically positive for vimentin in 100% of the meningiomas; CD34, 94%; GLUT-1, 86%; E-cadherin, 81%; S100, 75%; laminin, 72%; claudin-1, 60%; PGP 9.5, 55%; progesterone receptor, 44%; pancytokeratins, 39%; cytokeratins 8/18, 17%, and GFAP in 9%. Ki67 index did not correlate well with mitotic index. Based on these results and those in the human literature, immunohistochemistry for vimentin, CD34, and E-cadherin is proposed to support a diagnosis of meningioma. Immunohistochemistry for claudin-1, albeit of only moderate to low sensitivity in canine and feline meningiomas, may help to distinguish meningioma from some mesenchymal neoplasms involving the brain and associated structures, such as schwannomas, which in humans express claudin-1 poorly or not at all. Further studies with CD34, E-cadherin, and claudin-1 in canine and feline tumors that may mimic meningiomas are needed to determine the adequacy of this approach.
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Affiliation(s)
- J. A. Ramos-Vara
- Animal Disease Diagnostic Laboratory and Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana
| | - M. A. Miller
- Animal Disease Diagnostic Laboratory and Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana
| | - E. Gilbreath
- Diagnostic Center for Population and Animal Health, Michigan State University, East Lansing, Michigan
| | - J. S. Patterson
- Diagnostic Center for Population and Animal Health, Michigan State University, East Lansing, Michigan
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Takeuchi Y, Ohnishi Y, Matsunaga S, Nakayama H, Uetsuka K. Intracranial meningioma with polygonal granular cell appearance in a Chihuahua. J Vet Med Sci 2008; 70:529-32. [PMID: 18525181 DOI: 10.1292/jvms.70.529] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A menigioma with polygonal granular cell proliferation in an 11-year and 8-month-old male Chihuahua is described. The tumor was observed under the dura matter of the right cerebrum. Microscopically, the tumor consisted of solid growth foci of small- or large- sized polygonal cells, with pale-stained nuclei, prominent nucleoli, and fine granular to foamy eosinophilic cytoplasm. Some of the proliferating cells contained variable amounts of cytoplasmic PAS-positive granules. Immunohistochemical analysis revealed that neoplastic cells were positive for vimentin and S-100 protein. Ultrastructurally, the neoplastic cells contained vesicular structures with a few small round-shaped bodies in the cytoplasm. We diagnosed the case as canine meningioma with granular cell appearance.
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Affiliation(s)
- Yoshinori Takeuchi
- Department of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan.
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16
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Reis JL, Kanamura CT, Machado GM, França RO, Borges JRJ, Santos RL. Orbital (retrobulbar) meningioma in a Simmental cow. Vet Pathol 2007; 44:504-7. [PMID: 17606511 DOI: 10.1354/vp.44-4-504] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A 12-year-old Simmental cow was presented with a moderately firm irregular whitish mass of approximately 5 cm in diameter, occupying the right orbit. Microscopically, a poorly differentiated neoplasm was observed. The immunohistochemical panel included cytokeratins, vimentin, epithelial membrane antigen, Factor VIII, CD34, Mart-1, Melan A, smooth muscle actin, desmin, chromogranin, neuron-specific enolase, S-100 protein, and MIB-1. The neoplasm was negative for all of them, with the exception of vimentin and S-100 protein. Transmission electron microscopy revealed abundant desmosomes. These findings support the diagnosis of orbital (retrobulbar) meningioma.
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Affiliation(s)
- J L Reis
- Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Brasília, DF, Brazil
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