[Extracorporeal shock wave lithotripsy for ureteral stones which caused spontaneous peripelvic extravasation: report of three cases].

We treated 3 cases of ureteral stones which caused spontaneous peripelvic extravasation by extracorporeal shock wave lithotripsy (ESWL). None had histories of trauma or operation. The obstructing stones measured 6 x 5, 6 x 5 and 4 x 3 mm respectively, and each was located in a left upper, right upper and right lower ureter. The drip infusion pyelography (DIP) and computerized tomography (CT) revealed a mildly dilated collecting system and ureter of affected site and extravasation of contrast material around the kidneys. These stones were successfully crushed and discharged by ESWL performed with an EDAP LT-01 device. One week after the last ESWL, the DIP showed favorable urograms and extinctions of extravasation. As ESWL could achieve a release of calculous obstruction easily with a safe and non-invasive procedure, we confirmed it to be an effective treatment for similar types of ureteral stones causing peripelvic extravasation.