[Posterior urethral valve. Experience with 4 cases].
D002648:Child; D002675:Child, Preschool; D003558:Cystoscopy; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D011859:Radiography; D014521:Urethra / Q000000981:diagnostic imaging; D014522:Urethral Diseases / Q000175:diagnosis / Q000601:surgery*; D001743:Urinary Bladder / Q000000981:diagnostic imaging; D014547:Urinary Diversion; D014718:Vesico-Ureteral Reflux / Q000175:diagnosis