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Diamniotic twin pregnancies with a single placental mass; prediction of chorionicity at 11 to 14 weeks of gestation
Author(s) -
Moon Min Hoan,
Park Su Yeon,
Song Mi Jin,
Yang Jae Hyug,
Kim Moon Young,
Hong Sung Ran,
Park Seong Ho
Publication year - 2008
Publication title -
prenatal diagnosis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.956
H-Index - 97
eISSN - 1097-0223
pISSN - 0197-3851
DOI - 10.1002/pd.2112
Subject(s) - amnion , gestation , obstetrics , medicine , twin pregnancy , gynecology , fetal membrane , pregnancy , placenta , fetus , biology , genetics
Abstract Objective To assess the accuracy of transvaginal ultrasound (US) in the prediction of the chorionicity of diamniotic twin pregnancies with a single placental mass at 11 to 14 weeks of gestation. Method From June 2006 to April 2007, we determined chorionicities by depiction of the amnion and chorion at the membrane‐to‐placental interface using transvaginal US. Pregnancies were classified as monochorionic when two layers of the amnion were identified as dichorionic when either one layer of the chorion and two layers of the amnion or one layer of the chorion and one layer of the amnion were seen. Results In 65 out of 70 (92.9%) diamniotic twin pregnancies with a single placental mass, we were able to determine the chorionicity by depiction of the amnion and chorion at the membrane‐to‐placental interface using transvaginal US. The predictive accuracy was 100% (95% confidence interval: 92–100%) for 52 twin pregnancies considered to be dichorionic by transvaginal US and 100% (95% CI: 73–100%) for 13 twin pregnancies considered to be monochorionic. Conclusion The chorionicity of diamniotic twin pregnancies with a single placental mass can be reliably predicted by transvaginal US depiction of the amnion and chorion at 11 to 14 weeks of gestation. Copyright © 2008 John Wiley & Sons, Ltd.