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.
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Spirt et al. (1979) studied this question.