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Tail Root Osteosarcoma in a Chipmunk (Tamias sibiricus)

Laboratory of Veterinary Pathology, College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa, Japan (HT, HK, HS, TS); and Onuma Animal Hospital, Koshigaya, Saitama, Japan (MO)

Abstract

An 8-year-old chipmunk (Tamias sibiricus) showed a mass on the tail root. Histologically, the excised mass showed proliferation of spindle-to-polyhedral cells and abundant multinucleated giant cells, with the production of neoplastic osteoid. Immunohistochemically, neoplastic cells were positive for vimentin and weakly positive for osteocalcin. Osteoid was also positive for osteocalcin. This tumor was diagnosed as a giant cell–type osteosarcoma. This is the first case report of osteosarcoma in a chipmunk.

Key words: Chipmunk (Tamias sibiricus); histology; immunohistochemistry; osteosarcoma.

Dr. T Sato, Laboratory of Veterinary Pathology, College of Bioresource Sciences, Nihon University, Kameino 1866, Fujisawa, Kanagawa 252-8510, (Japan). E-mail: t-sato{at}brs.nihon-u.ac.jp