Detection of twin-twin transfusion syndrome by first trimester ultrasonography.
D000328:Adult; D005260:Female; D005330:Fetofetal Transfusion / Q000000981:diagnostic imaging*; D005333:Fetus / Q000033:anatomy & histology; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal