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Vet Pathol 44:243-246 (2007)
© 2007 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

A Mixed Epithelial and Stromal Tumor of the Kidney in a Ringtail Lemur (Lemur catta)

S. Muller, A. Oevermann, C. Wenker, H. J. Altermatt and N. Robert

Institute for Animal Pathology, VETSUISSE-Faculty, University of Berne, Berne, Switzerland (SM, AO, NR); Zoo Basel, Basel, Switzerland (CW); Dres. Kraft Altermatt Meister Pathologie Länggasse, Bern, Switzerland (HJA); Centre for Fish and Wildlife Health, Institute for Animal Pathology, VETSUISSE-Faculty, University of Berne, Berne, Switzerland (NR)

Abstract

Primary renal tumors are rare neoplasms in nonhuman primates. This report describes a mixed epithelial and stromal tumor of the kidney (MESTK) in a 14.5-year-old female ringtail lemur. The well-demarcated, solid, and cystic mass was located in the pelvis of the left kidney and consisted histologically of both epithelial and mesenchymal components. The mesenchymal cells were arranged in fascicles around cysts lined by a well-differentiated epithelium. Neither the mesenchymal nor the epithelial parts showed significant nuclear atypia or mitotic figures. To our knowledge, only 1 similar case, classified as adenoleiomyofibromatous hamartoma, has been reported in a ringtail lemur. In humans this tumor affects predominantly perimenopausal women and can express estrogen and progesterone receptors. However, neither estrogen nor progesterone receptors could be identified by immunohistochemistry in the tumor of the present ringtail lemur. Therefore, a hormonal mechanism could not be demonstrated in this case.

Key words: Kidney; kidney neoplasms; lemurs; primates.

Request reprints from S. Muller, Institute for Animal Pathology, VETSUISSE-Faculty, University of Berne, Länggassstrasse 122, Postfach 8466, CH-3001 Berne (Switzerland). E-mail: stephanie.mueller{at}itpa.unibe.ch






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Copyright © 2007 by the American College of Veterinary Pathologists.