"Situations that may mimic a low-lying placenta on a trans-abdominal scan include"
"focal myometrial contraction(s) stretching the lower uterine segment"
"RIsk factors"
"Retroplacental haematoma, which may appear as a hypoechoic or heterogeneous area between the placenta and the myometrium"
Expected headings
"RIsk factors"
"A low-lying placenta detected on ultrasound in the second trimester typically resolves by the mid-third trimester; as such, a follow-up ultrasound is recommended at 32 weeks 1. Rarely (in ~1.5% of cases), it can persist to term or near term 9."