Proximal stent displacement as complication of pigtail ureteral stent

The indwelling ureteral stent recently introduced by Cook offers relative ease of placement with a self-curling end which prevents migration down the ureter. We have seen 4 cases of proximal migration of these stents. The reasons for this event are described. Our experience suggests the placement of a suture in the distal portion of the catheter to allow retrieval of the catheter should migration occur.