Document Detail

First trimester ultrasound determination of chorionicity in twin pregnancy.
MedLine Citation:
PMID:  21308842     Owner:  NLM     Status:  Publisher    
OBJECTIVES: To determine the accuracy of ultrasound at 11-14 weeks' gestation in the diagnosis of chorionicity in twin pregnancy. METHODS: A retrospective observational study between 1999 and 2010. At the first trimester routine ultrasound scan, chorionicity was assigned according to the number of placental masses and the 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 out of 613 pregnancies (accuracy 99.8%) The sensitivity and specificity for determining monochorionicity was 100% and 99.8%, respectively. CONCLUSIONS: First trimester ultrasound can be used to reliably determine chorionicity 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. Copyright © 2011 ISUOG. Published by John Wiley & Sons, Ltd.
Tiran Dias; Tiziana Arcangeli; Amar Bhide; Raffaele Napolitano; Samina Mahsud-Dornan; Basky Thilaganathan
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-1-31
Journal Detail:
Title:  Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology     Volume:  -     ISSN:  1469-0705     ISO Abbreviation:  -     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-2-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9108340     Medline TA:  Ultrasound Obstet Gynecol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 ISUOG. Published by John Wiley & Sons, Ltd.
Fetal Medicine Unit, St George's University of London, United Kingdom.
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