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. 2020 Mar 9;6(Suppl 2):S110–S121. doi: 10.1055/s-0039-3402036

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Fig. 1 — Pathological definition of placenta previa accreta spectrum. ( a ) Placenta previa accrete. Chorionic villi directly attached to the uterine myometrium with complete or partial absence of the decidua basalis in a case with placenta previa. Those conditions can be classified as total, partial, or focal adherence of the placenta by the clinical and pathological findings abutting the myometrium. ( b ) Placenta previa increta. Chorionic villi invade deeply into the myometrium layer in a case with placenta previa. ( c ) Placenta previa percreta. Chorionic villi penetrate myometrium into the uterine serosa and the bladder, or perforate the uterine wall into the pelvic cavity in a case with placenta previa. (Reproduced with permission from Takeda S. Cesarean section for placenta previa and placenta previa accrete spectrum. In: Hiramatsu Y, Konishi I, Sakuragi N, Takeda S, eds. Mastering the Essential Surgical Procedures OGS NOW, No.3. Cesarean section. (Japanese). Tokyo: Medical View; 2010:102–115. Copyright © Medical View).