BILATERAL RENAL METASTASES OF NASAL CHONDROSARCOMA IN A DOG

Chondrosarcoma is the most common nonepithelial sinonasal neoplasm in the dog, and metastasis is considered rare. A 7-year-old Irish Setter had bilateral renal enlargement 17 months following surgery and radiot herapy for a primary nasal chondrosarcoma. Histologic evaluation revea led chondrosarcoma metastases in both kidneys. A diagnosis of nasal ch ondrosarcoma with bilateral renal metastasis was made. The clinical im portance of this report is that routine recommendations for the evalua tion of regional and/or distant metatasis in a dog with a dignosis of nasal chondrosarcoma, namely routine whole body physical examination a nd thoracic radiography, failed to demonstrate the presence of abdomin al metatases, which ultimately led to the demise of this dog. The biol ogically aggressive nature of this chondrosarcoma of the nasal cavity indicates that additional information is needed before a prognosis can be reliably established for dogs with this tumor type.