Case report: further upward migration of a misplaced double-J ureteral stent.

A 45-year-old man was referred to our hospital for the removal of a misplaced double-J ureteral stent. The lower end of the stent shortly after insertion was at the level of sacroiliac joint. However one week later the stent was further migrated upwards to the level of 4th lumbar vertebra. Immediate ureterorenoscopy was performed to prevent further migration of the stent to the renal pelvis and the stent was removed by the grasping forceps under direct vision successfully.