Oncocitoma renal gigante

renal oncocytoma is a benign neoplasms arising from cells of the distal renal tubule. they acount for 3-7% of all renal tumors. most are incidental findings. differential diagnosis with renal cells carcinoma is often difficult. here we report a case of big renal oncocytoma as an incidental finding while performing an abdominal ultrasound in a patient with low abdominal pain. we also review the diagnostic an therapeutic approach in this kind of malignancies.