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Veterinary Pathology, Vol 36, Issue 4 342-344, Copyright © 1999 by American College of Veterinary Pathologists

ARTICLES

Thyroid C-cell carcinoma with amyloid in a red fox (Vulpes vulpes schrenchki)

K. Hirayama, Y. Kagawa, K. Nihtani and H. Taniyama

An amyloid-producing medullary thyroid carcinoma (MTC) in a red fox (Vulpes vulpes schrenchki) bred in a zoo was examined using histopathologic and immunohistochemical techniques. The neoplastic cells had an ill-defined cytoplasmic membrane and abundant, finely granular eosinophilic cytoplasm, containing numerous argyrophilic granules. The neoplastic tissues were divided into various sizes by a vascular connective stroma, which was partly fibrovascular with broad areas of hyalinization containing varied amounts of amyloid. Immunohistochemically, neoplastic cells showed reactivity to anti-calcitonin, neuron-specific enolase, somatostatin, and keratin antibodies. However, amyloid in the stroma did not show immunoreactivity to the antibodies used. Histologic and immunohistochemical features of MTC in the present animal were analogous to those of the C-cell carcinoma derived from thyroid C cells (parafollicular cells) reported in humans and dogs.


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