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Vet Pathol 41:183-185 (2004)
© 2004 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Malignant Ameloblastic Fibro-odontoma in a Dog

H. Ueki, A. Sumi, H. Takaishi, H. Ito, T. Oyamada and H. Yoshikawa

Abstract

An 11-year-old male Collie was presented with a swelling of the face caused by tumor masses arising from the gingiva. Postmortem examination revealed metastases to the lymph nodes, lung, liver, and orbital cavity. Histologically, the tumor represented a combination of fibrosarcomatous proliferation, pulpal mesenchyme, and undifferentiated odontogenic epithelium, with a follicular or plexiform growth pattern. In addition, the follicular areas of the tumor showed a biphasic character, and there were numerous apoptotic cells in plexiform areas. Furthermore, acidophilic material resembling dysplastic dentine or enamel matrix was observed in the metastatic lesion in the lung. Based on the histological characters, the present case was diagnosed as malignant ameloblastic fibro-odontoma. This study is the first known description of a possible malignant ameloblastic fibro-odontoma in a dog with metastasis to distant organs.

Key words: Ameloblastic fibro-odontoma; dogs; malignant.

Request reprints from Dr. H. Ueki, Department of Veterinary Pathology, Faculty of Veterinary Medicine and Animal Sciences, Kitasato University, 35-1 Higashi-23-bancho, Towada, Aomori 034-8628 (Japan). E-mail: hiroyasu{at}vmas.kitasato-u.ac.jp.






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