Bleeding from the birth canal, in excess of 5ml, From the 20 th week of gestation to the birth of the baby. Fetal vessels lying in the membranes in front of the presenting part. Bleeding from a normally situated placenta after 20 weeks. Absence of decidua basalis, with chorionic villi attached to uterine muscle. Placenta increta the villi are in the muscle wall.
Placenta percreta the villi are through the muscle wall, usually into bladder wall.