Invasion of CHORIONIC VILLI occurs through the MYOMETRIUM penetrating the uterine SEROSA. Invasion of CHORIONIC VILLI occurs deep into the MYOMETRIUM. Abnormal placentation in which all or parts of the PLACENTA are attached directly to the MYOMETRIUM due to a complete or partial absence of DECIDUA. It is associated with POSTPARTUM HEMORRHAGE because of the failure of placental separation.
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