title: Fetal phallus 'erection' interfering with the sonographic determination of fetal gender in the first trimester.
authors.forename: D A
authors.initials: DA
authors.lastname: Pedreira
authors.forename: A
authors.initials: A
authors.lastname: Yamasaki
authors.forename: C E
authors.initials: CE
authors.lastname: Czeresnia
mesh_terms: D000886:Anthropometry; D005260:Female; D005333:Fetus / Q000502:physiology*; D006801:Humans; D010410:Penile Erection; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011446:Prospective Studies; D012732:Sex Determination Analysis; D016216:Ultrasonography, Prenatal