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臍带附着于卵膜上,仅有血管与胎盘相連称为臍带卵膜附着或者帆状胎盘。(Insertio Velamentosa,(?))。若臍带卵膜附着之血管跨过子宮內口,經过前羊水囊的卵膜时,称之前置血管(Vasa praevia)。当它破裂或受压时可引起产前来自胎儿方面的出血,胎儿窘迫,死胎,死产,新生儿貧血等。本病甚为罕見,現将我院从1950年至1964年5月底止,近13年半所遇之五例报告于下:
Umbilical cord attached to the egg membrane, only the blood vessels connected with the placenta are called umbilical cord membrane attachment or sail-like placenta. (Insertio Velamentosa, (?)). If the umbilical cord attached to the membrane of the blood vessels across the mouth of the uterus, past the anterior epicardial membrane of the egg, said the pre-blood vessels (Vasa praevia). When it ruptures or pressure can cause prenatal bleeding from the fetus, fetal distress, stillbirth, stillbirth, neonatal anemia and so on. The disease is very rare, now our hospital from 1950 to 1964 end of May, nearly 13 years and a half encountered five cases reported in the next: