Ureteral stones can cause ureteral obstruction, resulting in obstruction of the urine produced by the kidneys in the process of downstream discharge, and some urine is retained in the kidneys, resulting in hydronephrosis. Treatment options are as follows: 1. If the diameter of ureteral stones is less than 1cm, extracorporeal shock wave lithotripsy is recommended, and after lithotripsy, the stones are discharged and the ureteral obstruction is restored, then the hydronephrosis can disappear. 2. If ureteral stones are examined and the volume is greater than 1cm, extracorporeal lithotripsy can be considered, but repeated lithotripsy treatment is required. If the stone is huge, and it is multi-stone with stone street-like change, laparoscopic ureterotomy can be performed to retrieve the stone or open surgery to retrieve the stone, and the effect of extracorporeal shock wave lithotripsy is not good at this time. This is not good.