[Renal oncocytoma: report of 14 cases and review of the literature].

Renal oncocytoma is an uncommon tumor. Of 223 renal tumors that were treated at our institution from 1970-1991, 14 (6.2%) were oncocytomas [9 females (65%) and 5 males (35%)]. The highest incidence was observed in the sixth decade (60.7 yrs). Tumor size range from 2 to 19 cm in diameter (mean = 8.07 cm); 11 (78.5%) were localized in the right kidney, principally in the superior pole. The tumor was incidentally discovered in 8 cases (57%); 1 case presented Wunderlich's syndrome; 1 had a palpable renal mass; 6 had abdominal pain. All the tumors were confined to the kidney. Thirteen were Robson stage I and 1 stage II. According to the UICC classification, 12 were T1, 1 T2 and 1 T3. All tumors were N0 M0. Patient evaluation included IVP (6), US (12), CT (14) and selective renal arteriography (2). The typical angiographic patterns were not observed in these 2 cases. Concerning the CT findings, in 8 cases (57%) the first diagnosis discarded was that of hypernephroma, although there were also signs suggestive of oncocytoma. Six cases (43%) showed signs indicating oncocytoma as first diagnosis. All patients were submitted to radical nephrectomy, which achieved good results in all cases at 7 months' to 5 years' follow up.