经产妇，足月经阴顺娩一男婴，体重 3900go胎盘挽出后半小时内有较多量间歇 性阴道出血，色鲜红，给予肌肉及宫体注 缩宫素10U,再次查看胎盘完整，胎膜有 —处见血管中断于胎膜边缘。究其出血原 因最可能是(       )

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