Ultrasonic diagnosis of embryonic malformations.
D000033:Abortion, Threatened; D000818:Animals; D005321:Extraembryonic Membranes; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D008722:Methods; D011247:Pregnancy; D011296:Prenatal Diagnosis; D013223:Statistics as Topic; D013997:Time Factors; D014463:Ultrasonography