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Updated: Jan 20, 2026

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
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Neonatal outcomes between discordant monochorionic and dichorionic twins.

Yong Hee Park1, Young Nam Kim1,2, Do Hwa Im1

  • 1Department of Obstetrics and Gynecology, Busan Paik Hospital, Busan, Republic of Korea.

The Journal of Maternal-Fetal & Neonatal Medicine : the Official Journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians
|August 17, 2019
PubMed
Summary

Monochorionic twins have a higher risk of birth weight discordance. However, non-complicated monochorionic and dichorionic discordant twins show no significant differences in maternal outcomes or neonatal mortality and morbidity.

Keywords:
Chorionicitydichorionic twindiscordant twinmonochorionic twinperinatal mortalitytwin pregnancy

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Area of Science:

  • Obstetrics and Gynecology
  • Perinatology
  • Neonatology

Background:

  • Twin pregnancies present unique challenges in obstetrics and neonatology.
  • Chorionicity (monochorionic vs. dichorionic) significantly impacts pregnancy course and outcomes.
  • Discordant fetal growth in twins requires careful monitoring for potential complications.

Purpose of the Study:

  • To compare obstetrical complications and neonatal outcomes between monochorionic and dichorionic discordant twin pregnancies.
  • To investigate differences in neonatal outcomes and morbidity in non-complicated discordant twins based on chorionicity.

Main Methods:

  • Retrospective cohort study of 296 twin pregnancies.
  • Comparison of obstetrical complications, neonatal mortality, and morbidity between monochorionic and dichorionic twins.
  • Analysis of outcomes in discordant twins, excluding monochorionic-specific complications.

Main Results:

  • Monochorionic twins exhibited increased risks of fetal death in utero and inter-twin birth weight discordance compared to dichorionic twins.
  • No significant differences were observed in overall obstetrical complications, neonatal mortality, or morbidity between the two groups.
  • After excluding fetal death and monochorionic-specific complications, discordant twins showed no significant outcome differences based on chorionicity.

Conclusions:

  • While monochorionic twins face a higher risk of birth weight discordance, this does not translate to poorer maternal or neonatal outcomes in uncomplicated cases.
  • Chorionicity does not appear to be an independent risk factor for adverse maternal or neonatal outcomes in non-complicated discordant twin pregnancies.
  • Further research may explore specific management strategies for discordant twins based on chorionicity and the presence of complications.