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Title: | First-trimester ultrasound determination of chorionicity in twin pregnancy |
Authors: | Dias, T. Arcangeli, T. Bhide, A. Napolitano, R. Mahsud-Dornan, S. Thilaganathan, B. |
Keywords: | Pregnancy, Twin |
Issue Date: | 2011 |
Publisher: | Wiley |
Citation: | Ultrasound in Obstetrics and Gynecology. 2011; 38(5): pp.530-32 |
Abstract: | OBJECTIVE: 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. |
Description: | Indexed in MEDLINE |
URI: | http://repository.kln.ac.lk/handle/123456789/2107 |
ISSN: | 0960-7692 (Print) 1469-0705 (Electronic) |
Appears in Collections: | Journal/Magazine Articles |
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