title: Monozygotic twinning and the Duhamel anomalad (imperforate anus to sirenomelia): a nonrandom association between two aberrations in morphogenesis.
mesh_terms: D001006:Anus, Imperforate / Q000453:epidemiology*; D004480:Ectromelia / Q000453:epidemiology*; D004933:Esophageal Atresia / Q000453:epidemiology; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007668:Kidney / Q000002:abnormalities; D009024:Morphogenesis; D011247:Pregnancy; D012189:Retrospective Studies; D014427:Twins; D014428:Twins, Conjoined; D014430:Twins, Monozygotic; D014599:Uterus / Q000002:abnormalities