title: First-trimester ultrasound: the essentials.
abstract: A review of first-trimester ultrasound findings is presented. The normal first trimester, including practical embryology and pregnancy dating, is first discussed. Abnormal first-trimester findings, including sonographic evaluation of the failing pregnancy, ectopic pregnancy, gestational trophoblastic disease, and first-trimester cystic hygroma, are then stressed. This report reviews the spectrum of findings encountered by sonographers while evaluating early pregnancy.
authors.affiliation: Department of Radiology, University of Utah School of Medicine, Salt Lake City 84132, USA.
authors.forename: R
authors.initials: R
authors.lastname: Sohaey
authors.forename: P
authors.initials: P
authors.lastname: Woodward
authors.forename: W J
authors.initials: WJ
authors.lastname: Zwiebel
mesh_terms: D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000000981:diagnostic imaging*; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal