The acardiac foetus.
D009008:Abnormalities, Severe Teratoid / Q000196:embryology* / Q000473:pathology; D004200:Diseases in Twins; D005260:Female; D005318:Fetal Heart / Q000002:abnormalities; D005333:Fetus / Q000473:pathology; D006801:Humans; D008297:Male; D011247:Pregnancy; D011272:Pregnancy, Multiple; D014430:Twins, Monozygotic