Ultrasound shows a placenta in a suitable location. Loss of the retroplacental-myometrial interface. The placenta is heterogeneous, with multiple tortuous hypoechoic structures within it (“Swiss cheese” placental appearance). Doppler US demonstrates turbulent flow (placental lacunae). There is a high velocity (peak systolic velocity of 19.7 cm/s).
The fetus is morphologically normal. Gestational age of 17.5 weeks by ultrasound.