Extensive involvement of renal pelvis with TCC on CT and retrograde pyelography

A CT scan through the kidneys (A) shows extensive involvement and obliteration of the left renal pelvis with a large TCC (arrow). Image B is a retrograde urogram and shows a large filling defect involving the left renal pelvis (arrowhead) and encasement of the ureteropelvic junction and infundibulum (arrow) with secondary upstream hydronephrosis (asterisk).