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Implanting of a prophylactic double J stent during ureteroneocystostomy has been adopted as routine procedure for preventing anastomotic complications. In extremely rare events, the coiled distal end of the stent migrates upward through ureterovesical anastomosis into the peritoneal cavity. We report below a case that presented with chronic urinary ascites secondary to ureteral stent displacement which was successfully treated by endoscopic intervention.

Perirenal extravasation of urine is a rare event in congenital uropathies, mostly observed perinatally in the case of infravesical obstruction. We describe a male infant with a primary non-refluxing obstructive left megaureter who developed an acute perirenal extravasation and ascites at the age of 4 weeks. After temporary upper urinary diversion, ureterocystoneostomy was successfully performed. Intraoperatively, the distal ureter showed an extremely narrow lumen over a distance of 3 cm. In the current literature, postnatal management of primary megaureters is preferably conservative. Our patient demonstrates an extremely rare complication demanding early surgical intervention. [ABSTRACT FROM AUTHOR]