Placental Anatomy and Function in Twin Gestations

Matthew A. Shanahan, Michael W. Bebbington

Research output: Contribution to journalReview articlepeer-review

3 Scopus citations


With an increasing incidence of twin gestations, understanding the inherent risks associated with these pregnancies is essential in modern obstetrics. The unique differences in placentation in twins contribute to the increased risks. Monochorionic twins are susceptible to complications because of their unique placental architecture, including twin-to-twin transfusion syndrome, the twin anemia-polycythemia sequence, selective intrauterine growth restriction, and the twin reversed arterial perfusion sequence. Knowing the clinical correlations of placental anatomy in these gestations helps perinatal pathologists perform a more informed placental evaluation, allowing for better care for the mother and her children.

Original languageEnglish
Pages (from-to)99-116
Number of pages18
JournalObstetrics and Gynecology Clinics of North America
Issue number1
StatePublished - Mar 2020


  • Monochorionic placenta
  • Selective intrauterine growth restriction
  • Twin anemia-polycythemia sequence
  • Twin placenta
  • Twin reversed arterial perfusion
  • Twin-to-twin transfusion syndrome


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