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Sonographic determination of first trimester twin chorionicity and amnionicity
Author(s) -
Hill Lyndon M.,
Chenevey Paula,
Hecker Julie,
Martin Jerry G.
Publication year - 1996
Publication title -
journal of clinical ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.272
H-Index - 61
eISSN - 1097-0096
pISSN - 0091-2751
DOI - 10.1002/(sici)1097-0096(199607/08)24:6<305::aid-jcu4>3.0.co;2-m
Subject(s) - medicine , obstetrics , monochorionic twins , twin pregnancy , gynecology , first trimester , zygosity , gestational age , gestation , pregnancy , biology , genetics
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. © 1996 John Wiley & Sons, Inc.