Application of flexible renoureteroscope for antegrade urethroscopy in the treatment of congenital anterior urethral valve.

Antegrade urethroscopy was performed through a cystostomy using a 10.8-fr caliber flexible renoureteroscope in 4 children (aged 2 years and 8 months, 2 months, 14 years and 1 month) with anterior urethral valve. The anatomy of the valves as well as their destruction after transurethral resection (TUR) were well visualized by antegrade urethroscopy. This technique was helpful in performing TUR-valve, after which the findings of voiding cystourethrography in every case and the findings of uroflowmetry in the elder 2 cases showed remarkable improvement. This technique is relatively simple to perform and is thought to be one of the best methods to treat anterior urethral valve. This technique is also applicable to other lower urinary tract lesions in children.