Post-partum retained products of conception (RPOC) >5mm (<2mm RPOC unlikely)
A variable amount of echogenic or heterogeneous material within the endometrial cavity
May presents like an endometrial or intrauterine mass
Vascularity within the echogenic material supports the diagnosis
The absence of color Doppler flow has a low negative predictive value because retained products of conception may be avascular
Possible calcification present
Retained products of conception can be suspected on ultrasound if the endometrial thickness is >10 mm following dilatation and curettage or spontaneous abortion (80% sensitive).
