What is ocnocytoma?

➢ Oncocytoma, a benign neoplasm that arises from the intercalated cells of collecting ducts ➢ Represents about 10% of renal neoplasms. ➢ Associated with genetic changes—loss of chromosomes 1 and Y—that distinguish them from other renal neoplasms. ➢Characterized by a plethora of mitochondria, providing the basis for their tan color and their finely granular eosinophilic cytoplasm, seen histologically. ➢ A central stellate scar, which is another feature of oncocytomas, provides a characteristic appearance on imaging studies