[Two cases of megaureter in children].

We reported 2 cases of megaureter in children. The courses of renal function and ureteral dilatation in these patients were observed by urography and renoscintigraphy to determine the timing of surgery. These two patients with unilateral megaureter were treated by reconstructive operation involving excision of the stenotic portion of the ureter, tapering of the dilated ureter and re-implantation. The courses after reconstruction were excellent after 5 years. Recently, active surgery has been recommended for megaureter together with identification of the cause. Urograms and diuretic renoscintigrams were useful for determining the timing of surgery in our cases.