Posterior urethral valve.
D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D014524:Urethral Obstruction / Q000151:congenital* / Q000175:diagnosis; D001748:Urinary Bladder Neck Obstruction / Q000151:congenital* / Q000175:diagnosis; D014563:Urodynamics; D014567:Urography