If someone has a focal placenta accreta can it detach and come out on its own? have you ever heard of this? or would this be unusual?

Placenta Accreta: Placenta Accreta usually occurs when the placenta attaches to a scar from a previous cesarean section. If the placenta grows into the scar it is called placenta increta. If it grows through the wall of the uterus it is called placenta percreta. These are serious problems which can lead to a cesarean hysterectomy. The diagnosis is suspected by ultrasound or MRI. A focal accreta could detach.