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Renal mucus gland cystadenomas in a horse

Correspondence: ¹Corresponding Author: Alan T. Loynachan, Iowa State University, College of Veterinary Medicine, Department of Veterinary Diagnostic and Production Animal Medicine, Ames, IA 50011. alanl{at}iastate.edu

A 35-year-old horse was submitted to the necropsy service at the University of Kentucky Livestock Disease Diagnostic Center. At necropsy, multiple 1–4-cm-diameter cystic structures were incidentally identified unilaterally in the right renal medulla and the cortex. On histologic examination, the cystic structures compressed the normal renal architecture, were lined by tall columnar epithelium that formed occasional papillary projections, and contained large amounts of mucicarmine and periodic acid–Schiff-positive mucinous material. The masses were diagnosed as renal mucus-gland cystadenomas. This tumor should be considered as a differential diagnosis when cystic structures are identified in the equine kidney.

Key Words: Cystadenoma • equines • kidney • mucus gland