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Related Experiment Video

Updated: Jul 25, 2025

Mouse Model of Surgical Uterine Injury and Subsequent Pregnancy Outcomes
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Published on: June 27, 2025

124

Relationship between Abnormal Placenta and Obstetric Outcomes: A Meta-Analysis.

Shinya Matsuzaki1,2, Yutaka Ueda2, Satoko Matsuzaki3

  • 1Department of Gynecology, Osaka International Cancer Institute, Osaka 541-8567, Japan.

Biomedicines
|June 28, 2023
PubMed
Summary

Abnormal placentas, like circumvallate and succenturiate types, are linked to higher risks of cesarean delivery and preterm birth. These placental variations require recognition as high-risk factors in pregnancy management.

Keywords:
abnormal placentabilobed placentacircumvallate placentamultilobed placentaplacenta membranaceasuccenturiate lobesystematic review

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Area of Science:

  • Obstetrics and Gynecology
  • Perinatology
  • Reproductive Medicine

Background:

  • The placenta's role in pregnancy is vital, yet abnormal placentas, affecting 2-4% of pregnancies, have understudied obstetric outcomes.
  • Understanding the prevalence and impact of placental abnormalities is crucial for improving maternal and fetal health.

Purpose of the Study:

  • To systematically review and determine the obstetric outcomes and prevalence of various abnormal placentas.
  • To synthesize existing literature on circumvallate, succenturiate, multilobed, and placenta membranacea.

Main Methods:

  • A systematic review of 48 studies published between 1974 and 2022.
  • Analysis of cumulative prevalence and associated obstetric outcomes for specific placental variations.

Main Results:

  • Cumulative prevalence: circumvallate placenta (1.2%), succenturiate placenta (1.0%), multilobed placenta (0.2%), and placenta membranacea (0.004%).
  • Circumvallate placenta associated with increased emergent cesarean delivery, preterm birth, and placental abruption.
  • Succenturiate placenta linked to higher emergent cesarean delivery rates; mixed results for preterm birth and placental abruption.

Conclusions:

  • Abnormal placentas, including circumvallate and succenturiate types, are associated with significant adverse obstetric outcomes.
  • Placenta membranacea cases show high rates of abortion and placenta accreta spectrum.
  • While evidence is limited, abnormal placentas should be considered high-risk factors in pregnancy.