Abruptio placenta: sonographic and pathologic correlation.

In cases of abruptio placenta, the ultrasound examination may be negative if external bleeding occurs without a large enouth accumulation of blood to be sonographically visible. A positive sonogram may demonstrate either a retroplacental hematoma or a hematoma that has dissected beneath the chorionic membranes. Six cases of abruptio placenta are presented with sonographic and pathologic findings.