title: Prenatal percutaneous antegrade pyelography in posterior urethral valves: sonographic guidance.
mesh_terms: D000328:Adult; D005260:Female; D005315:Fetal Diseases / Q000209:etiology; D006801:Humans; D006869:Hydronephrosis / Q000209:etiology; D008297:Male; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis / Q000379:methods*; D014463:Ultrasonography; D014521:Urethra / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000196:embryology; D014567:Urography / Q000379:methods*