title: Ultrasonography in the detection of aneuploidy in the first trimester.
abstract: Ultrasonography has been used increasingly in the first trimester to identify fetal anomalies as early as possible in gestation. First trimester sonographic screening may detect a greater proportion of aneuploid fetuses than sonography performed later in pregnancy, and it may allow determination of potential markers for prediction of chromosomal anomalies.
mesh_terms: D000782:Aneuploidy; D015193:Chorionic Villi Sampling; D002869:Chromosome Aberrations / Q000175:diagnosis / Q000000981:diagnostic imaging*; D025063:Chromosome Disorders; D000013:Congenital Abnormalities / Q000000981:diagnostic imaging* / Q000235:genetics; D005260:Female; D005315:Fetal Diseases / Q000000981:diagnostic imaging* / Q000235:genetics; D006801:Humans; D007621:Karyotyping; D008297:Male; D011247:Pregnancy; D011446:Prospective Studies; D016216:Ultrasonography, Prenatal