Giant renal oncocytoma presenting with right flank pain and hematoma

Renal oncocytomas are benign tumors representing 3% to 7% of primary renal neoplasms. Oncocytomas are often asymptomatic, discovered incidentally on routine radiological imaging. We report a giant renal oncocytoma in a 68-year-old male with chronic kidney disease. Patient had right upper quadrant pain and hematoma. The mass was palpable on physical exam. CT scan showed a 16 cm × 14 cm right renal mass, consistent with renal cell carcinoma, no major adenopathy, no renal vein invasion. Right radical nephrectomy was performed and histological examination was consisted with oncocytoma.