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Veterinary Pathology, Vol 36, Issue 1 71-73, Copyright © 1999 by American College of Veterinary Pathologists

ARTICLES

Extraskeletal osteosarcoma of the mandibular salivary gland in a dog

B. V. Thomsen and R. K. Myers
Department of Veterinary Pathology, College of Veterinary Medicine, Iowa State University, Ames 50011-1250, USA. bthomsen@iastate.edu

A 14-year-old spayed female shepherd/collie crossbred dog had a 6 x 4-cm mass excised from below the right ear. The partially encapsulated, neoplastic mass had a necrotic core and was embedded in the mandibular salivary gland. Histologically, the mass was composed of numerous multinucleate giant cells and large, oval, pleomorphic cells that produced osteoid. Neoplastic cells were immunoreactive for vimentin and actin but not for keratin, desmin, or S-100 protein. At postmortem examination 1 month later, an 11-cm spherical mass had recurred at the surgical site, and there were metastatic nodules in the lungs, ipsilateral mandibular lymph nodes, and kidney. The tumor was diagnosed as an osteosarcoma of the mandibular salivary gland with pulmonary, lymphatic, and renal metastasis. In addition, a 17-year survey of canine salivary-gland neoplasms revealed that most were adenocarcinomas or carcinomas.


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