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Purpose: Urinary calculi is a familiar disease. A well-known complication of endourological treatment for impacted ureteral stonesis the formation of ureteral strictures, which has been reported to occur in 14.2% to 24% of cases. Materials and Methods: This was a prospective study. Ureterotripsy treatment was used on patients with impacted ureteralstones. Then, after 3 months and 6 months, the condition of these patients was assessed by means of a kidney-ureter-bladder (KUB)ultrasound. If the KUB ultrasound indicated moderate to serious hydronephrosis, the patient was further assessed by means of acomputed tomography intravenous urogram or retrograde pyelogram to confirm the occurrence of ureteral strictures. Results: Of the 77 patients who participated in the study, 5 developed ureteral strictures. Thus, the stricture rate was 7.8%. Ananalysis of the intraoperative risk factors including perforation of the ureter, damage to the mucous membrane, and residual stoneimpacted within the ureter mucosa revealed that none of these factors contributed significantly to the formation of the uretericstrictures. The stone-related risk factors that were taken into consideration were stone size, stone impaction site, and duration ofimpaction. These stone factors also did not contribute significantly to the formation of the ureteral strictures. Conclusions: This prospective study failed to identify any predictable factors for ureteral stricture formation. It is proposed that allpatients undergo a simple postoperative KUB ultrasound screening 3 months after undergoing endoscopic treatment for impactedureteral stones.

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