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Retrobulbar malignant peripheral nerve sheath tumor in a golden retriever dog: A challenging diagnosis
Cécile Briffod1, Pierre Hélie1, Julie De Lasalle1
1Department of Clinical Sciences (Briffod, De Lasalle, Vanore), Department of Pathology and Microbiology (Hélie), Faculté de Médecine Vétérinaire, Université de Montréal, 3200 rue Sicotte, Saint-Hyacinthe, Quebec J2S 2M2; Department of Oncology, Centre Vétérinaire Rive-Sud, 7415 Taschereau, Brossard, Québec J4Y 1A2 (de Lorimier); Veterinary Pathology Services, Joint Pathology Center, 606 Stephen Sitter Avenue, Silver Spring, Maryland 20910, USA (Moreau, Alves).
Abstract:
A 9-year-old golden retriever dog was diagnosed with a left retrobulbar mass. Fine-needle aspirations and incisional biopsies resulted in discordant diagnoses: myxosarcoma/myxoma or rhadomyosarcoma, respectively. Immunohistochemistry following exenteration allowed definitive diagnosis of malignant peripheral nerve sheath tumor with fibromyxomatous differentiation. Fifteen weeks after surgery, an aggressive recurrence resulted in euthanasia.
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