title: Posterior urethral obstruction caused by congenital posterior urethral valve; prenatal and postnatal ultrasound diagnosis.
mesh_terms: D000293:Adolescent; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014463:Ultrasonography; D014521:Urethra / Q000002:abnormalities*; D014524:Urethral Obstruction / Q000175:diagnosis* / Q000209:etiology