Velamentous inseion of the cord is associated with an increased risk for:
With velamentous inseion of the cord, the umbilical vessels separate in the membranes at a distance from the placental margin, which they reach surrounded only by amnion. It occurs in about 1% of singleton gestations but is quite common in multiple pregnancies. When fetal vessels cross the internal os (vasa pre), rupture of membranes may be accompanied by rupture of a fetal vessel, leading to fetal exsanguination.
Maternal hemorrhage prior to delivery
Can cause fetal exsanguinations before labor due to blood loss
Torsion of the umbilical cord and fetal death
Increased fetal malformations incidence
Placenta - Types and their complications