title: Vaginal ultrasound: an invaluable component of modern obstetric ultrasound.
authors.forename: F A
authors.initials: FA
authors.lastname: Chervenak
authors.forename: B
authors.initials: B
authors.lastname: Arabin
mesh_terms: D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging; D005333:Fetus / Q000033:anatomy & histology; D006801:Humans; D011247:Pregnancy; D016216:Ultrasonography, Prenatal; D014621:Vagina