[Multifocal renal oncocytoma: a case report].

A case of multifocal renal oncocytoma in a 55-year-old man admitted for further examination following the detection of left renal tumors, is reported. Computerized tomographic (CT) scanning and magnetic resonance imaging (MRI) revealed 2 masses in the left kidney. A left radical nephrectomy was performed and two tumors were found. Both tumors were confirmed to be renal oncocytomas by light and electron microscopic examination. Including this patient, 42 cases of bilateral and multifocal renal oncocytoma have been reported in the literature to date. The clinical features of bilateral and multifocal renal oncocytomas are discussed accordingly.