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A 25-year-old woman in the 19 week of a twin pregnancy andclaiming nonotablemedical history or obstetrical history was referred from a local medical doctor due to a significant fetal weight difference between the twins. According to the patient, the local medical practitioner reported that they could be dichorionic twins from antepartum examination (Figure 1). During examination, an ultrasoundwas performed in the clinic and the smaller twinwas revealed to have severe oligohydramnios, and the end diastolic flow of the umbilical artery was reversed. By contrast, the larger twin was diagnosed as having polyhydramnios (Figures 2 and 3). What could be the differential diagnosis?

Dichorionic Twin Pregnancy with Reversed Diastolic Flow of the Umbilical Artery in One of the Twins?