Copyright: © 2013 Androutsopoulos G, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Abnormal placental invasion is abnormal adherence of the placenta, either in whole or in part, to the underlying uterine wall [1]. Based on histopathology, it is divided into three grades: placenta accreta (the chorionic villi are in contact with the myometrium), placenta increta (the chorionic villi invade into the myometrium) and placenta percreta (the chorionic villi penetrate the uterine serosa and occasionally invade into adjacent organs) [1,2]