To differentiate renal oncocytoma from renal carcinoma

the clinical data of four patients with incidentally found renal oncocytomas were studied in this report. And additional Immunohistochemistry examinations were done to confirm diagnosis. Renal oncocytomas were found incidentally in four patients during medical examination. No characteristic changes were found in laboratory tests. Radiology examination provided the location and possibility of renal oncocytoma. History

laboratory test and radiology exanimation indicated the diagnosis of renal oncocytoma

but the final identify of renal oncocytoma need pathology examination.