In utero sonographic detection of abnormal twin pregnancy.
D000328:Adult; D000757:Anencephaly / Q000175:diagnosis*; D005260:Female; D005313:Fetal Death / Q000175:diagnosis*; D006801:Humans; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011296:Prenatal Diagnosis; D014427:Twins; D014463:Ultrasonography