Urethral valve Congenital posterior urethral valve 2011-01-18T10:51:22Z Posterior urethral valve A developmental defect resulting in an obstructing membrane in the posterior male urethra. 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). Congenital obstructing posterior urethral membranes Posterior urethral valves HP:0010957 UMLS:C0238506 SNOMEDCT_US:253900005 COPUM Urethrovesical occlusion