title: The enigma of anencephaly and spina bifida.
mesh_terms: D000022:Abortion, Spontaneous; D000757:Anencephaly / Q000209:etiology; D002490:Central Nervous System / Q000196:embryology; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011272:Pregnancy, Multiple; D016135:Spinal Dysraphism / Q000209:etiology