Dias, T.Arcangeli, T.Bhide, A.Napolitano, R.Mahsud-Dornan, S.Thilaganathan, B.2014-10-292014-10-292011Ultrasound in Obstetrics and Gynecology. 2011; 38(5): pp.530-320960-7692 (Print)1469-0705 (Electronic)http://repository.kln.ac.lk/handle/123456789/2107Indexed in MEDLINEOBJECTIVE: To determine the accuracy of ultrasound at 11-14 weeks' gestation in the diagnosis of chorionicity in twin pregnancy. METHODS:This was a retrospective observational study of data obtained between 1999 and 2010. At the first-trimester routine ultrasound scan,chorionicity was assigned according to the number of placental masses and T or λ-signs for a single placental mass. Chorionicity was confirmed by histology or discordant sex at birth. RESULTS: A total of 648 pregnancies were assigned chorionicity by first-trimester ultrasound during the study period. Chorionicity was ascertained in 613 cases, either by histology (n = 340) or discordant sex (n = 273). Chorionicity was correctly assigned by ultrasound at 11-14 weeks in 612 of 613 pregnancies (accuracy 99.8%). Sensitivity and specificity for determining monochorionicity were 100% and 99.8%, respectively.CONCLUSIONS:First-trimester ultrasound can be used to determine chorionicity reliably by noting the number of placental masses and T or λ-signs.Determination of twin chorionicity is important and should be completed in the first trimester.Pregnancy, TwinArticleObstetrics and Gynaecology