RADIOLOGY: KIDNEY: Case# 32998: R. RENAL MASS-RCC W/BRAIN METS. The patient is a 57 year old female with a brain metastasis. CT is requested to evaluate for primary. 1) 7 cm right lower pole necrotic renal mass. The appearance is consistent with renal cell carcinoma. There is no definite invasion of adjacent structures or large lymph nodes and the renal vein is patent. However, the patient has a known brain lesion which is likely a metastasis.