JOURNAL ARTICLE
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Endoureterotomy for treatment of primary obstructive megaureter in children.

PURPOSE: To describe a new approach to the treatment of primary obstructive megaureter (POMU) using endoscopic endoureterotomy. The results obtained with this technique are reviewed with long-term follow-up.

PATIENTS AND METHODS: A total of 47 children (mean age 3.7 years) with 52 POMU units and a history of failed conservative management underwent endoureterotomy of obstructed juxtavesical and intramural ureter. A 3F Double-J ureteral stent was introduced up to the obstructed segment of ureter. Then a zebra catheter was inserted into the affected ureter beside the stent, followed by a neonatal-size ureteroscope. Following delineation of the length of the narrowed portion of the ureter, a guidewire with a plastic sheath replaced the zebra catheter. A longitudinal incision was made through the detrusor muscle at the 6 o'clock position, leaving the bladder adventitia untouched. The Double-J stent was left in place, while its distal tip was fixed by long nylon suture and single knot to the external genitalia to permit easy removal 1 week after the procedure.

RESULTS: With a mean follow-up of 39 months (range 14-62 months), no leakage, ureteral-orifice obstruction, or reflux was observed. The postoperative success rate was 90% (47 of 52 ureters), defined as resolution or decrease in hydroureteronephrosis and improvement or stability of renal function determined by renal scan. In 37 ureterorenal units (71%), there was complete resolution of hydroureteronephrosis.

CONCLUSIONS: On the basis of previous studies demonstrating the value of endoureterotomy with stenting for the treatment of benign ureteral strictures in adults, we developed a modified endoscopic approach for the treatment of POMU and applied this technique in meticulously selected cases. Our results showed that this approach is a valid option for the treatment of children with POMU.

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