Subchorionic hematoma (SCH) is a specific pathology of pregnancy, as a sonographically-detected, intrauterine, echo-free area located between the membranes and the uterine wall. No reports have described SCH complicated by different antenatal complications in patients with spontaneous abortion. The patients herein present four cases of SCH accompanied by different complications, including Sjogren's syndrome (SS), antiphospholipid syndrome (APS), cervical incompetence (CI), and undifferentiated

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... onnective tissue diseases (UCTD). All the four patients with a history of spontaneous abortion delivered healthy babies. Additionally, the authors also reviewed previously reported cases regarding SCH. Appropriate treatment can effectively improve pregnancy outcomes in patients with a history of spontaneous abortion and SCH complicated by other complications.