title: Placental considerations in multiple pregnancy.
abstract: This article contains a brief description of the placenta in multiple pregnancy, including a classification based on embryogenesis. The biologic and clinical importance of recognition of the different types of twin placentas is emphasized. Finally, a classification of the pathological lesions seen in these placentas, either because of the twinning process or simply associated with it, is proposed.
authors.affiliation: Department of Pathology, University of Illinois School of Medicine, Chicago.
authors.forename: W A
authors.initials: WA
authors.lastname: Bardawil
authors.forename: R L
authors.initials: RL
authors.lastname: Reddy
authors.forename: L W
authors.initials: LW
authors.lastname: Bardawil
mesh_terms: D000013:Congenital Abnormalities / Q000196:embryology; D004622:Embryo, Mammalian / Q000502:physiology; D005260:Female; D006801:Humans; D010920:Placenta / Q000473:pathology; D011247:Pregnancy; D011272:Pregnancy, Multiple; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic