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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.