Reliability of voiding cystourethrography to detect urethral obstruction in boys.

Objectives: To evaluate the reliability of voiding cystourethrography (VCUG) to diagnose infravesical obstruction in boys.

Methods: Hard copies of the VCUG findings of 72 boys were assessed by two pediatric radiologists and two pediatric urologists. The investigators were instructed to consider six items related to infravesical obstruction: vesicoureteral reflux, bladder wall thickness, bladder diverticulum, abnormal prostatic urethra, visible urethral obstruction, and obstruction in the sphincter area.