Renal oncocytoma.
Renal oncocytoma is a rare tumor of probable proximal tubular origin characterized by uniform cells with abundant, granular, brightly eosinophilic cytoplasm containing numerous mitochondria. The tumor is benign clinically and can be distinguished from renal cell carcinoma.
D000230:Adenocarcinoma / Q000175:diagnosis; D000236:Adenoma / Q000175:diagnosis / Q000473:pathology*; D000293:Adolescent; D003937:Diagnosis, Differential; D006801:Humans; D007680:Kidney Neoplasms / Q000175:diagnosis / Q000473:pathology*; D008297:Male