Abstract：Todiscuss the cause and the treatment of ureteral steinstrasse formation after retrograde intrarenal surgery. Methods: 338 patients undergoing retrograde intrarenal surgery were retrospectively reviewed, including 5 cases of ureteral steinstrasse after retrograde intrarenal surgery. There were 4 men and 1 woman. The mean age was 51 years. The diameter of stone ranged from 1.5 cm to 3.5 cm, and 2.8 cm averagely. Four patients were diagnosed as unilateralrenal stone and 1 as bilateral renal stone. Ureteroscopiclithotripsy was performed on all patients. Three patients were given Holmium laser lithotripsy for the crushing stones gathering into a mass. Stones in the other 2 patients were taken out by basket extractor because the gathering stones were loose. The mean operation time was 85 min. Results: The residual ureteral stones were cleared free in 5 patients. Double J stents were placed after ureteroscopic lithotripsy and removed 2 weeks later. Conclusions: The cause of ureteral steinstrasse formation after retrograde intrarenal surgery includes the large size of stone, the large size of residual stones, the cruor or effusion not be removed promptly and injuries of ureter during the surgery.
