Abstract: Objective：To compare the imaging characteristics and histopathological features of pregnancies with intrauterine hematomas (IUHs) in the second and third trimesters. Methods：A total of 21 pregnant women who underwent prenatal ultrasound (US) and magnetic resonance imaging (MRI) in our hospital from Jan. 2013 to Dec. 2017 were enrolled with intraoperative or histopathological evidence of placental clots. Maternal clinical demographics, gestational ages, imaging features of hematoma, and maternal-fetal outcomes were recorded. Results：The diagnostic accurate rate of MRI in IUHs was 85.7% (18/21), the misdiagnosed rate was 14.3% (3/21), which consisted of submucous degenerative myoma(1), chorioangioma(1), and intervillous infarction (1). The presence of IUHs on MRI could be classified into three locations, including subchorionic marginal placental (12/18), intraplacental (5/18), and retroplactental (4/18). The supplementary diagnostic rate of MRI to US is 38.9% (7/18). After IUHs occurred, the maternal-fetal outcomes included abortion with fetal demise (44.4%), premature labor (50%), and full-term delivery (5.6%) with alive newborns. Conclusions：Prenatal MRI examination can provide additional information about the location and extent of IUHs than US and is helpful for the prenatal consultant and decision making.