脐带附着异常包括：脐带帆状附着(cord velamentous insertion)及球怕状胎盘。前者是指脐带附着于胎膜卜，脐带血管通过羊膜与绒毛膜间进入胎盘，后者系指脐带附着于胎盘边缘。
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The main causes of the death of one fetus in twin pregnancy were cord elements(5 cases), fetal deformity(3 cases), velamentous insertion(4 cases)and unknown etiology(15 cases).
双胎之一胎儿死亡主要原因：脐带因素5例、胎儿畸形3例、帆状胎盘4例、原因不明15例。
Methods 5 cases of vasa previa in velamentous insertion of umbilical cord were analyzed retrospectively.
方法对5例脐带帆状附着前置血管进行回顾性分析。
The distance from the placental edge to the insertion of the umbilical cord was measured after delivery, and the results were used to classify cord insertion as normal, marginal, or velamentous.
分娩后测量脐带附着点到胎盘边缘的距离，将结果分为正常附着、边缘性附着和帆状附着。
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