Abstract
Objective To evaluate the total number of inter-twin contacts between monochorionic diamniotic (MD) and dichorionic diamniotic (DD) twins using four-dimensional (4D) sonography late in the first trimester of pregnancy. Method Six MD and 8 DD pregnancies were studied for 30 minutes with 4D sonography at 10–11 and 12–13 weeks of gestation. A total of 10 types of inter-twin contact was evaluated. Results There was a significant difference in the total number of all contacts between MD and DD twins at the 10–11 weeks of gestation ( P < 0.05). There was also a significant difference in the total number of contacts between 10–11 and 12–13 weeks of gestation in DD twins ( P < 0.05). Conclusion Four-dimensional sonography provides a means of evaluating inter-twin contact in the first trimester of pregnancy and could be an accurate and reliable tool in studies of inter-twin behavior.
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