[Oncocytic cell tumor. Problems, diagnosis, therapy].

Renal oncocytoma is an uncommon tumor. At least 203 such cases have been reported. This urologic condition represents a diagnostic difficulty and because its natural history has not been elucidated, its treatment remains a controversy. Two recent cases of renal oncocytoma seen at our Urology Service prompted us to review the literature and analyze the diagnostic methods, therapeutic approach and its prognosis.