Congenital posterior urethral valve is a cause of bladder outlet obstruction in male newborns. It results from a failure of resorption of the caudal end of the Wolffian duct into the primitive cloaca at the site of the future verumontanum in the posterior urethra (Following normal resorption of the posterior urethral valve there remain the posterior urethral folds, also called plicae colliculi).