International braz j urol : official journal of the Brazilian Society of Urology
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This work evaluates the results of ureteroscopic treatment of impacted ureteral stones with a pneumatic lithotripter. ⋯ Ureteroscopy for impacted ureteral calculi is associated with a higher incidence of ureteral perforation and stricture. Ureteroscopy of proximal ureteral calculi is associated with a high risk of perforation, when compared to mid or distal ureteral calculi. Ureteral perforation at the site of the stone seems to be the primary risk factor for stricture formation in these cases.