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Vet Pathol 41:75-78 (2004)
© 2004 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Rete Testis Mucinous Adenocarcinoma in a Dog

Z. A. Radi, D. L. Miller and M. E. Hines, II

Abstract

A bilateral testicular neoplasm from an 11-year-old mixed-breed male dog was removed surgically and examined histologically. The neoplasm was nonencapsulated and composed of acinar and tubular structures lined by one or more layers of neoplastic polyhedral epithelial cells with an abundant mucinous secretion. On histochemistry, all neoplastic cells and associated secretions were periodic acid–Schiff positive. Some neoplastic cells and all associated secretions were positive on mucicarmine stain, and some neoplastic cells, all the stroma, and associated secretions were positive on alcian blue stain. On immunohistochemistry, the neoplastic cells had strong diffuse cytoplasmic immunoreactivity for cytokeratin and vimentin, weak scattered cytoplasmic immunoreactivity for carcinoembryonic antigen and neuron-specific enolase, and no immunoreactivity for S-100. On the basis of histopathology, histochemistry, and immunohistochemical findings, a diagnosis of mucinous adenocarcinoma of rete testis was made. Rete testis adenocarcinoma is a well known but very rare neoplasm in humans. To our knowledge, this is the first report of the mucinous variant of adenocarcinoma of the rete testis in a dog.

Key words: Dogs; rete testis mucinous adenocarcinoma; testicular neoplasm.

Request reprints from Dr. Z. A. Radi, Veterinary Diagnostic and Investigational Laboratory, The University of Georgia, 43 Brighton Road, PO Box 1389, Tifton, GA 31793 (USA). E-mail: zradi{at}tifton.uga.edu.






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