title: Should the frontal bone be visualized in midline sagittal views of the facial profile to assess the fetal nasal bones during the first trimester?
authors.forename: L F
authors.initials: LF
authors.lastname: Gonçalves
authors.forename: J
authors.initials: J
authors.lastname: Espinoza
authors.forename: W
authors.initials: W
authors.lastname: Lee
authors.forename: R
authors.initials: R
authors.lastname: Romero
mesh_terms: D004314:Down Syndrome / Q000000981:diagnostic imaging*; D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D009295:Nasal Bone / Q000000981:diagnostic imaging*; D011247:Pregnancy; D016216:Ultrasonography, Prenatal / Q000379:methods*