Assertion: chorion's surface | /r/HasProperty | subamniotic hemorrhage
Facets:
Source sentences:
text: Small hematomas on the surface of the placenta (subamniotic hemorrhage) are common at 18 to 20 weeks on ultrasound, but hemorrhages identified beneath the placenta, at the edge of the placenta, or behind an isolated area of the fetal membranes is of greater significance.