Renal oncocytoma

• Benign
• ~1/3 have central stellate scar detectable on CECT (overall ~50% of oncocytomas have central stellate scar on pathology)
• Nonspecific sonographic appearance and overlaps with RCC
• RCC central necrosis or hemorrhage can simulate a central scar
• These lesions should almost always be surgically removed or ablated since they can't reliably be differentiated from RCC (unless core-needle biopsy is performed which proves oncocytoma)