Abstract
COMBINED studies by excretory urography and angiography have recently demonstrated that branches of the renal artery can impinge upon the proximal collecting system and cause filling defects anywhere in the calyxes, pelvis or proximal ureter.1 2 3 These reports showed that vascular impressions can mimic defects caused by tumors and stones, but little consideration was given in them to the physiologic significance of the vessels except when they produced hydronephrosis by obstructing the ureteropelvic junction. No attention was devoted to the possibility that renal vessels could produce obstruction at other sites in the proximal collecting system, particularly the infundibula.The ureteropelvic junction . . .