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ABSTRACT. Stelmann U.J.P., Silva A.A, Souza B.G., Oliveira G.F., Mello E.B.F.R.B, Souza G.C.J. & Hess T.M. Dermoid cyst in sheep - A Case Report. [Cisto dermóide em ovino - Relato de Caso]. Revista Brasileira de Medicina Veterinária, 34(2):127-130, 2012. Programa de Pós-Graduação em Ciência, Tecnologia e Inovação em Agropecuária, Universidade Federal Rural do Rio de Janeiro, BR 465, Km 7, Seropédica, RJ 23890-000, Brasil. E-mail: email@example.com A dermoid cyst is a non-neoplasic, benign dermatologic injury. This article describes the finding of a dermoid cyst that was surgically extracted in a nine months aged ewe. The patient was admitted to the Large Animal Veterinary Hospital Department at the Federal Rural of Rio de Janeiro University, with a history of a non-healing wound that also contained fur. The ewe was referred to the surgical service and the histopathologic analysis of the lesion revealed a structure lined by stratified epithelium containing hair follicles, sudoriparous and sebaceous glands, which are conclusive for a dermoid cyst diagnosis.