Mesenchymal chondrosarcoma in the maxillary gingiva of a Maltese dog: a case report

A 13-year-old castrated male Maltese dog was presented to a local animal hospital with an oral hemorrhage. An intraoral examination revealed irregular proliferated lobular mass at the right side of maxillary gingiva and hard palate. surgically excised requested for histopathology examination. Histopathologically, neoplastic foci were composed biphasic morphologic patterns, such as primitive mesenchymal tissue mature or immature cartilage tissue. Immunohistochemically, most cells forming cartilaginous islands tested positive S-100; surrounding vimentin. This paper describes rare case chondrosarcoma in dog.