Report on four cases of trisomy 18 syndrome.
D000015:Abnormalities, Multiple; D002902:Chromosomes, Human, 16-18; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D012886:Skull / Q000002:abnormalities; D013577:Syndrome; D014314:Trisomy