[A case of renal oncocytoma with multilocular cyst]

A 63-year-old woman was admitted to our hospital for a left renal tumor with multiple cystic lesions. Computed tomography and renal angiography revealed a hypovascular tumor 9 cm in diameter and multilocular cyst with a thick wall. Renal cell carcinoma and multilocular cystic nephroma were suspected, and left nephrectomy was performed. Histopathological diagnosis of this tumor was renal oncocytoma.