title: "Double-bubble" sign visualized in first-trimester sonogram?".
authors.forename: B
authors.initials: B
authors.lastname: Benacerraf
mesh_terms: D000013:Congenital Abnormalities / Q000000981:diagnostic imaging; D004386:Duodenum / Q000002:abnormalities*; D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal