Placenta Accreta Spectrum Disorder refers to a group of pregnancy complications characterized by the abnormal attachment of the placenta to the uterine wall. In this condition, the placenta grows too deeply into the uterine wall, which can lead to serious complications during delivery.

There are three main types of placenta accreta spectrum:

1. Placenta Accreta: The placenta attaches too deeply into the uterine wall but does not penetrate the uterine muscle.
2. Placenta Increta: The placenta grows deeper into the uterine muscle.
3. Placenta Percreta: The placenta penetrates through the uterine wall and can invade surrounding organs.

Risk factors for this condition include previous pregnancies with cesarean deliveries, uterine surgery, advanced maternal age, and the presence of certain uterine abnormalities. Diagnosis can often be made via ultrasound or MRI during pregnancy.

Management typically involves careful monitoring, and in some cases, planned cesarean delivery with potential hysterectomy after delivery to prevent severe bleeding and other complications. Early diagnosis and interdisciplinary care are crucial for the health of both the mother and baby.