In vasa previa, fetal blood vessels, as opposed to maternal blood vessels, are present in the membranes covering the cervix, which is the opening to the uterus. The baby comes through the cervix once the opening is completely open. The prevalence of vasa previa is approximately 1 in 2500 deliveries but is much higher in pregnancies
Vasa previa is a rare, but extremely dangerous (to the fetus), condition of pregnancy where a placental blood vessel crosses over the maternal cervix. If not diagnosed, the risk of fetal death is approximately 50%. The blood vessels in the umbilical cord and inner surface of the placenta are all an extension of the fetal
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