[Renal oncocytoma. Apropos of 9 cases]

The authors report nine cases of renal oncocytoma which were observed in a series of 220 consecutive renal cell carcinomas. They share the general view concerning the clinical latency of these tumors which are rarely hematuric, and concerning the favorable prognosis, despite signs of locoregional malignancy. On the other hand, they do not share the opinion that arteriography or CT scan can provide a reliable preoperative differential diagnosis with the normal type of renal cell carcinoma.