RADIOLOGY: KIDNEY: Case# 33353: RIGHT ANGIOMYELOLIPOMA & LEFT RENAL MASS. This is a 77-year-old female who has been complaining of left upper quadrant pain for four or five days.She states a history of a benign lesion removed from the right kidney along with a cyst removed from the colon several years prior. 1. Large complex cystic mass in the upper pole of the left kidney. This is most consistent with renal cell carcinoma. 2. Mass in the right kidney consistent with angiomyolipoma. This may be similar to the benign lesion removed from the right kidney several years ago. 3. Diverticulosis without signs of diverticulitis.