Bilateral renal oncocytomas: a case report.

We report on a man with bilateral multiple renal oncocytomas who had enlarged kidneys, and presented with loin pain and gross hematuria. A provisional diagnosis of multiple renal oncocytomas was made after renal angiography demonstrated the characteristic appearance of this tumor. The diagnosis was confirmed with histology of an open renal biopsy specimen. This case is unique in that the lesions were multiple and bilateral. The patient had impaired renal function and, hence, the necessity for conservative management once the histological diagnosis had been established. Since in previously reported cases oncocytomas have been removed completely our case provides an opportunity to observe the natural history of the disease.