Concordant posterior urethral valves in male monochorionic twins with secondary prune belly syndrome.

Background: Posterior urethral valves (PUVs), the most common congenital cause of lower urinary tract obstruction, have been described to occur in identical and nonidentical twins. Until now, reports have been published on 15 cases of PUVs.

Aim: We report a new case of concordant PUVs in one set of male monochorionic twins with secondary Prune Belly Syndrome.