A condition in which the placenta invades the muscles of the uterus and becomes firmly attached to the uterine wall, making it difficult to remove after the baby is delivered.

Abnormal growth of the placenta deep into the uterine wall, making seperation of the placenta after delivery difficult and often requiring manual removal.

Placenta accreta is a severe obstetric complication involving an abnormal attachment of the placenta to the myometrium (the middle layer of the uterine wall). There are three forms of placenta accreta, distinguishable by the depth of penetration.