<unk>  is thought to arise from the intercalated cells of collecting ducts of the kidney. It represent 5% to 15% of surgically resected renal neoplasms. Ultrastructurally, the eosinophilic cells have numerous mitochondria. Histologic appearance An<unk>  is an epithelial tumor composed of oncocytes, large eosinophilic cells having small,<unk> und, benign-appearing nuclei with large nucleoli and excessive amounts of mitochondria.
Renal oncocytoma
Renal medullary fibroma
Renal medullary carcinoma
Renal anaplastic sarcoma
Papillary renal cell carcinoma
Renal cell carcinoma
Renal cyst
Clear cell papillary renal cell carcinoma