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by Boston Women's Health Book Collective
In rare instances, the placenta implants abnormally, often in a scar from a previous cesarean section or other surgery on the uterus. The placenta can then grow into this scar and occasionally even through the wall of the uterus into other organs, such as the bladder. These abnormalities in attachment of the placenta are called placenta accreta, placenta increta, and placenta percreta, depending ...