<prompt> The following is associated with increased risk for :-Premature rupture of membranesPost paum haemorrhageFetal exsanguination before labourFetal NTDs  <response>: Velamentous placenta - The umbilical cord vessels travel within the membrane before reaching placental margin . - Rupture of the membranes involving the overlying vessels lead to vaginal bleeding. - As it is entirely fetal blood, this may result in fetal exsanguination and even death in more than 50 of cases. This condition is actually called Vasa pre when these membraneous vessels overlie the cervical os 