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Vet Pathol 42:215-218 (2005)
© 2005 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

A Case of Canine Apocrine Sweat Gland Adenoma, Clear Cell Variant

K. Nibe, K. Uchida, T. Itoh and S. Tateyama

Abstract

A cutaneous mass at the base of the retroauricular region of a 4-year-old, female Golden Retriever was examined pathologically. Histologically, the mass formed multiple nodules consisting of a proliferation of large clear cells with abundant cytoplasm. Mitotic figures among the neoplastic cells were very sparse. The large clear cells were intensely positive for cytokeratins (AE1/AE4, cytokeratin 8 and 18) and moderately positive for lysozyme and contained periodic acid–Schiff-positive granules in the cytoplasm. In addition, small flat cells lined the islands of neoplastic large clear cells, and these were strongly positive for alpha–smooth muscle actin and vimentin, and some were positive for cytokeratin (AE1/AE4), suggesting they were myoepithelial cells. No local recurrence or metastasis has been recognized during the 18 months since surgical excision. On the basis of these findings, the present tumor was diagnosed as apocrine sweat gland adenoma, clear cell variant. There have been few previous reports of canine apocrine adenomas showing a clear cell morphology.

Key words: Apocrine adenoma; canine; clear cell; sweat gland.

Request reprints from Dr. K. Uchida, Department of Veterinary Pathology, Faculty of Agriculture, University of Miyazaki, Miyazaki-889-2155 (Japan). E-mail: a0d423u{at}cc.miyazaki-u.ac.jp


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