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Updated: Oct 25, 2025

Guide Wire Assisted Catheterization and Colored Dye Injection for Vascular Mapping of Monochorionic Twin Placentas
Published on: September 5, 2011
Mode of Delivery in Monochorionic Compared With Dichorionic Twin Pregnancies
Henry N Lesser1, Andrei Rebarber, Nathan S Fox
1Department of Obstetrics and Gynecology, Sinai Hospital, Baltimore, Maryland; and Maternal Fetal Medicine Associates, PLLC, and the Department of Obstetrics, Gynecology, and Reproductive Science, Icahn School of Medicine at Mount Sinai, New York, New York.
Monochorionic-diamniotic twin pregnancies have similar delivery modes and cesarean delivery rates compared to dichorionic-diamniotic twins. Neonatal outcomes also did not differ between groups when attempting vaginal delivery.
Area of Science:
- Perinatology
- Maternal-Fetal Medicine
- Obstetrics
Background:
- Twin pregnancies present unique delivery considerations.
- Monochorionic and dichorionic twins differ in placental sharing, potentially impacting delivery outcomes.
- Understanding delivery mode risks is crucial for optimizing maternal and neonatal care.
Purpose of the Study:
- To compare the mode of delivery between monochorionic-diamniotic and dichorionic-diamniotic twin pregnancies.
- To assess if monochorionic-diamniotic gestations have a higher risk of cesarean delivery.
- To evaluate neonatal outcomes in monochorionic-diamniotic pregnancies based on attempted vaginal delivery.
Main Methods:
- Retrospective cohort study of 1,121 diamniotic twin pregnancies (2005-2021).
- Comparison of baseline characteristics and delivery outcomes between monochorionic and dichorionic gestations.
- Statistical analysis included chi-squared, Fisher exact, and t-tests.
Main Results:
- No significant difference in overall cesarean delivery rates between monochorionic (61%) and dichorionic (63%) twins (P=.54).
- Cesarean delivery rates were also similar in women attempting vaginal delivery (22% vs 21%, P=.80).
- Neonatal outcomes did not differ for monochorionic twins at or after 34 weeks gestation, regardless of attempted vaginal delivery.
Conclusions:
- Monochorionic-diamniotic twin pregnancies do not carry an increased risk of cesarean delivery compared to dichorionic-diamniotic counterparts.
- The chorionicity of diamniotic twin pregnancies does not appear to influence the mode of delivery.
- Current evidence suggests similar safety profiles for delivery management in both types of diamniotic twin gestations.
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09:52Accurate and Simple Evaluation of Vascular Anastomoses in Monochorionic Placenta using Colored Dye
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09:51Model Surgical Training: Skills Acquisition in Fetoscopic Laser Photocoagulation of Monochorionic Diamniotic Twin Placenta Using Realistic Simulators
Published on: March 21, 2018
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