title: The S-shaped ductus arteriosus.
authors.forename: D L
authors.initials: DL
authors.lastname: Brown
authors.forename: C B
authors.initials: CB
authors.lastname: Benson
mesh_terms: D004373:Ductus Arteriosus / Q000000981:diagnostic imaging*; D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging*; D006330:Heart Defects, Congenital / Q000000981:diagnostic imaging*; D006801:Humans; D011247:Pregnancy; D014463:Ultrasonography