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Conjoined twins are extremely rare congenital malformations. Any associated genetic, environmental or demographic factors have not been identified. The phenomenon occurs between the 13th and 15th day after fertilization due to failure in splitting of embryonic axis. Twins are classified according to the major site of union, with the suffix pagus meaning fixed or fastened. Omphalopagus twins are the second most common variety of conjoined twins and usually are joined at the umbilicus. A 31-year-old pregnant female admitted for routine gestational control. Obstetric ultrasound (US) revealed two fetuses which were adherent from abdominal region. Their livers were fused however other organs were separated. Hepatic veins and portal veins were separated in both fetuses on color Doppler evaluation. Fetal magnetic resonance imaging (MRI) confirmed the diagnosis as omphalopagus conjoined twins. Twins were successfully delivered by cesarean section at 34th gestational week. Herein, US and MRI features of this rare anomaly in intrauterine and postpartum period are presented.

Presentation of ultrasound and magnetic resonance imaging findings of omphalopagus conjoined twins in the intrauterine and postpartum period