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为评价脐血管异常的产前筛查和评定这些异常对胎儿畸形的影响，对既往月经规律，孕24~32周的444例日本孕妇，在进行常规产科超声检查同时，
To evaluate the prenatal screening of umbilical vascular abnormalities and assess the impact of these abnormalities on fetal malformations, 444 Japanese pregnant women with previous menstrual cycles and gestational age of 24 to 32 weeks underwent conventional obstetric ultrasonography,