这个词是什么意思？
Abnormal placentation in which the PLACENTA implants in the lower segment of the UTERUS (the zone of dilation) and may cover part or all of the opening of the CERVIX. It is often associated with serious antepartum bleeding and PREMATURE LABOR.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D010923 · MeSH 2026。
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