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Placenta: Bleeding in Pregnancy
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  The placenta completely covers the cervix (c). Placental abruption produced the blood clot (b) that is poorly visible on this T2-weighted image.
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  T1-weighted images better demonstrate the large placental blood clot and complete placenta previa. These images taken at 31 weeks gestation.
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  Subamniotic hematoma (arrow) in a 20 week pregnancy.
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  The majority of the placenta is attached here, but blood has tracked into the potential subchorionic space (arrow). These images were taken at 16 weeks gestation. Note that the hematioma (arrow) is bright around the perifery, but dark in the center on T1-weighted image.  
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  T1-weighted images.