title: What's new in first trimester ultrasound.
abstract: There are several advantages to ultrasound examination in early pregnancy. Ultrasound performed during the first trimester confirms an intrauterine pregnancy, establishes accurate dating, and is crucial in diagnosing early pregnancy failure and ectopic pregnancy. As sonographic spatial resolution continues to improve, first trimester sonography increasingly will offer early pregnancy screening for chromosomal abnormalities and fetal structural abnormalities.
authors.affiliation: Department of Diagnostic Radiology, Brown Medical School, 593 Eddy Street, Providence, RI 02903, USA. ELazarus@Lifespan.org
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Lazarus
mesh_terms: D006063:Chorionic Gonadotropin / Q000097:blood; D025063:Chromosome Disorders / Q000000981:diagnostic imaging; D004622:Embryo, Mammalian / Q000002:abnormalities / Q000000981:diagnostic imaging*; D005260:Female; D005333:Fetus / Q000002:abnormalities; D030342:Genetic Diseases, Inborn / Q000000981:diagnostic imaging*; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome; D011261:Pregnancy Trimester, First; D011271:Pregnancy, Ectopic / Q000097:blood / Q000000981:diagnostic imaging* / Q000188:drug therapy / Q000601:surgery; D016216:Ultrasonography, Prenatal; D015017:Yolk Sac / Q000000981:diagnostic imaging
chemical_list: D006063:Chorionic Gonadotropin