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This is a retrospective study to determine the predictive value and comparison of first trimester (1) crown-rump length discordance and (2) abnormal cord insertion as screening tests for poor outcome in monochorionic diamniotic twin pregnancies. Retrospective data were collected over last 10 years from a single center (2009–2018). A total of 261 patients were a part of this study. CRL discordance or abnormal cord insertions are not accurate predictors of twin-to-twin transfusion syndrome, which corresponds to previously published data on the same subject. Both CRL discordance and abnormal cord insertions are strongly associated with selective fetal growth restriction (sFGR) as defined according to conventional criteria or the newer consensus criteria. A combination of these two markers substantially improves the screening rates, with a positive likelihood ratio of 10.33 for sFGR. However, this combination fails to distinguish the type 1 sFGR cases from the type 2/3, which typically have poorer outcomes. CRL discordance and abnormal cord insertions are strongly associated with the development sFGR in monochorionic pregnancies. A combination of these two markers shows promising potential as a screening test to identify pregnancies at a high risk for development of sFGR. Earlier diagnosis can help plan timely fetal intervention and improve the overall outcomes of these pregnancies. These markers need to be validated in larger studies before being adopted for screening of monochorionic pregnancies.

the journal of maternal-fetal and neonatal medicine

Comparison of crown-rump length discordance and abnormal cord insertions as first-trimester predictors of poor outcome in monochorionic diamniotic twin pregnancies