title: Prevalence and significance of subchorionic hemorrhage in threatened abortion: a sonographic study.
abstract: We performed a prospective study to determine the prevalence and significance of subchorionic hematomas in patients with symptoms of threatened abortion. The study comprised 342 pregnant women who had vaginal bleeding in weeks 9-20 of pregnancy and a live fetus shown with sonography. Sonograms showed a subchorionic hematoma in 62 patients (18%). The average size of the hematoma was 20 ml (range, 2-150 ml). The rate of spontaneous abortion was the same in patients with and without hematoma, seven (11%) of 62 and 28 (10%) of 280, respectively. There was no association between abortion rate and hematoma size. The rate of premature delivery was the same in patients with and without hematoma, seven (11%) of 62 and 32 (11%) of 280, respectively. There was no association between the rate of premature delivery and hematoma size. Subchorionic hematomas are common and insignificant sonographic findings in patients with vaginal bleeding in weeks 9-20 of pregnancy.
authors.affiliation: Department of Radiology, Glostrup Hospital, University of Copenhagen, Denmark.
authors.forename: J F
authors.initials: JF
authors.lastname: Pedersen
authors.forename: M
authors.initials: M
authors.lastname: Mantoni
mesh_terms: D000033:Abortion, Threatened / Q000209:etiology*; D000328:Adult; D002823:Chorion; D005260:Female; D006801:Humans; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular / Q000175:diagnosis*; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second; D014463:Ultrasonography; D014592:Uterine Hemorrhage / Q000150:complications* / Q000175:diagnosis