Abstract: Objective To study the method of ureteroscopy treatment on calculi displacement during laparoscopic ureterolithotomy(extraperitoneal approach,EPA).Methods To retrospectively study the clinical data of 12 cases of the auxiliary treatment on calculi displacement during operation for patients underwent laparoscopic ureterolithotomy(extraperitoneal approach,EPA)  for upper ureteral calculi in our hospital from October,2009 to October,2021.The clinical data included patients’ information,the condition of the displaced calculi,the duration of the auxiliary treatment on calculi removal during operation,the information whether there was an intraoperative ureteropelvic injury,whether there was a postoperative bleeding or infection,whether there were postoperative ureteral stricture and other complications.Result There were totally 333 cases of laparoscopic ureterolithotomy for upper ureteral calculi operated in our hospital,however,there were 12 of them where the ureteral calculi moving upward to the kidney.Flexible ureteroscope was adopt in lithotomy in three cases of them,and hard ureteroscope was adopted in lithotripsy and lithotomy in the other nine cases.Lithotomy was operated successfully in all the 12 cases with 100% success rate.The average duration of auxiliary treatment on calculi removal is 25 minutes.There were no obvious renal pelvis and ureter mucosal injury,no postoperative urinary leakage,no bleeding and infection,no ureteral stricture and other complications during follow-up for all the patients.Conclusion It is a safe and effective method of ureteroscopy to treat calculi displacement in laparoscopic ureterolithotomy.This method is simple,easy to operate.

Key words: ureteral calculi, laparoscopic ureterolithotomy, ureteroscopy, calculi displacement