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Placenta accreta occurs when all or part of the placenta attaches abnormally to the myometrium (the muscular layer of the uterine wall). Risk factors for placenta accreta include the number of previous cesarean deliveries, uterine surgery, advancing maternal age, and multiparity.
Three grades of abnormal placental attachment are defined according to the depth of invasion: Accreta: chorionic villi attach to the myometrium, rather than being restricted within the decidua basalis Increta: chorionic villi invade into the myometrium Percreta: chorionic villi invade through the myometrium.
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