Renal adenoma in a cat.

Renal adenoma, a benign tumor of epithelial origin, was diagnosed in a 10-year-old cat. Clinical signs included decreased appetite and weight loss. Nephrectomy resulted in clinical improvement. Seven months after surgery, the cat died, and pulmonary papillary adenocarcinoma was discovered. The pulmonary neoplasm differed markedly from the renal neoplasm.