A Rational Solution for Megaureter in Infants with Solitary Kidney: Temporary Loop Cutaneous Ureterostomy

Objective: To define and discuss the new concept which using loop cutaneous ureterostomy (LCU) in patients with obstructing megaureter and solitary kidney. Materials and Methods: Two patients with solitary kidney with obstructive pattern were included. Both patients underwent LCU within the 1^st month to reduce the obstruction and to relieve the pelvicaliceal system. Thereafter, parents were taught to dilate the ureter and irrigate the bladder with sterile saline by a disposable 6F catheter via antegrade fashion through the distal ureter. Initially, 10 cc saline was used once a day, then it was increased to 20 cc once a day after 2 months. When the bladder capacity was sufficient (50 mL capacity at the 6^th month or by cystoscopic evaluation intraoperatively), we performed undiversion with ureteroneocystostomy and Double-J-stent placement. Results: Ureterorenal dilatations were followed-up by ultrasonography and renal function tests. No bladder dysfunction and renal insufficiency were observed during follow-up. At the postoperative controls, patients' renal function tests were compatible with their ages and they had no voiding dysfunction. Conclusion: Patients with solitary kidney and obstructing megaureter require urgent diversion. After diversion, bladder cycling is required to prevent bladder dysfunction by protecting and developing bladder capacity. Using this concept, the kidney can be protected from further damage and treatment can be finalized around 6 months of age with minimum morbidity.