Placenta accreta is a serious pregnancy condition that occurs when the placenta grows too deeply into the wall of the uterus. Normally, after childbirth, the placenta detaches from the uterine wall. However, in the placenta accreta, either all or part of the placenta remains attached to the uterine wall. This can lead to severe bleeding after delivery. Because of this, placenta accreta is considered a very serious medical condition.