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Veterinary Pathology, Vol 33, Issue 1 77-80, Copyright © 1996 by American College of Veterinary Pathologists

ARTICLES

Equine papillary ependymoma

M. J. Carrigan, R. J. Higgins, G. P. Carlson and D. K. Naydan

A 17-year-old Arabian gelding with progressive neurologic signs had a velvety, reddish brain tumor protruding from the ventral midline caudal to the optic chiasma. Histologically, the tumor had a papillary formation with a single layer of elongate cells radially oriented around a central fibrovascular core. Intracytoplasmic globular inclusions were positive for glial fibrillary acidic protein and weakly positive for vimentin. Ultrastructurally, these inclusions were comprised of whorling intermediate filaments. Neoplastic cells also had cytoplasmic interdigitations and numerous zona adherens and often rested on a basal lamina. The tumor was diagnosed as a papillary ependymoma.


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C. R. Huxtable, A. de Lahunta, B. A. Summers, and T. Divers
Marginal Siderosis and Degenerative Myelopathy: a Manifestation of Chronic Subarachnoid Hemorrhage in a Horse with a Myxopapillary Ependymoma
Vet. Pathol., September 1, 2000; 37(5): 483 - 485.
[Abstract] [Full Text] [PDF]


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Copyright © 1996 by the American College of Veterinary Pathologists.