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Primary renal cell carcinoma in two horses.

Of 2 horses with renal cell carcinoma, 1 had massive ascites but no other signs of urinary tract disease; the other had hematuria. In both horses, the tumors were palpable as large perirenal masses. The tumor mass of horse 1 almost completely replaced the left kidney, and there were tumor implants on the serosa of abdominal organs. The right kidney of horse 2 was compressed peripherally by the tumor, which completely filled the renal pelvis. The prevalence of renal cell carcinoma in horses and dogs necropsied at the New York State College of Veterinary Medicine between 1953 and 1976 was similar, and these 2 species had a higher prevalence than cattle, cats, or swine.