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Vet Pathol 44:672-676 (2007)
© 2007 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Metastatic Iridociliary Adenocarcinoma in a Labrador Retriever

M. K. Zarfoss and R. R. Dubielzig

Department of Pathobiological Sciences, University of Wisconsin-Madison, Madison, WI

Abstract

An enucleated left eye from a 15-year-old female spayed Labrador Retriever was received by the Comparative Ocular Pathology Laboratory of Wisconsin (COPLOW) for histopathologic evaluation. Routine histologic preparation included staining with hematoxylin and eosin, and with alcian blue periodic acid–Schiff (PAS). At necropsy 9 months later, all grossly abnormal tissues (ipsilateral orbit and lung) were submitted to the COPLOW for histopathologic evaluation. Histopathologic evaluation of the globe revealed extensive invasion of the uvea and sclera by a pleomorphic cell population that formed disorganized cords and exhibited PAS-positive basement membrane material. Necropsy revealed a morphologically similar tumor in the ipsilateral orbit and lung. On immunohistochemical examination, the intraocular tumor stained diffusely immunopositive for vimentin, S-100, and neuron-specific enolase and multifocally, sparsely immunopositive for cytokeratin AE1/AE3. The orbital and thoracic tumors stained positively for vimentin but negatively for cytokeratin AE1/AE3. There are few reports of canine metastatic iridociliary adenocarcinoma in the literature; this is the first with immunohistochemical analysis.

Key words: Adenocarcinoma; dogs; eye; neoplasms; uvea.

Request reprints from Richard R Dubielzig, Department of Pathobiological Sciences, University of Wisconsin-Madison 2015 Linden Dr. Madison, WI 53706 (USA). E-mail: dubielzr{at}svm.vetmed.wisc.edu






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