孕早期双胎绒毛膜性和羊膜性的超声诊断

Sonographic determination of first trimester twin chorionicity and amnionicity.

作者信息

Hill L M, Chenevey P, Hecker J, Martin J G

机构信息

Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh School of Medicine, Pennsylvania, USA.

出版信息

J Clin Ultrasound. 1996 Jul-Aug;24(6):305-8. doi: 10.1002/(SICI)1097-0096(199607/08)24:6<305::AID-JCU4>3.0.CO;2-M.

DOI:10.1002/(SICI)1097-0096(199607/08)24:6<305::AID-JCU4>3.0.CO;2-M

PMID:8792270

Abstract

OBJECTIVE

To determine the reliability of first trimester sonography in the detection of twin chorionicity and amnionicity.

MATERIALS AND METHODS

Sets of twins (179) were evaluated sonographically in the first trimester. Chorionicity was determined by identifying the number of gestational sacs. The presence or absence of an amnion about each embryo/fetus was also recorded. The placentas for each case were evaluated to determine chorionicity and amnionicity.

RESULTS

Of the 179 twin pairs, 158 were dichorionic/diamniotic; 19 were monochorionic/diamniotic, and two pairs were monochorionic/monoamniotic. Chorionicity and amnionicity were correctly determined in each case.

CONCLUSION

The chorionicity of twin pregnancies can be determined from the time that the gestational sacs are visualized within the uterus. Transvaginal sonography can reliably determine the amnionicity of monochorionic twin pregnancies after 7 weeks, menstrual age.

摘要