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Ultrasound Obstet Gynecol. 2011 Nov;38(5):530-2. doi: 10.1002/uog.8956. Epub 2011 May 3.

First-trimester ultrasound determination of chorionicity in twin pregnancy.

Author information

1
Fetal Medicine Unit, St George's University of London, London, UK.

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.

PMID:
21308842
DOI:
10.1002/uog.8956
[Indexed for MEDLINE]
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