How can a fractured stent migrated outside the kidney?

Rarely.: A ureteral stent is a pliable tube inserted to keep the ureter, & therefore the passage from the kidney to the bladder, open. They possess a curl on each end to keep it in place. They can migrate, and usually this occurs out of the kidney toward the bladder. It is possible for a stent fragment to exit this space, if it erodes through the ureter or out of a ureteral incision. These events are rare.