Prenatal Diagnosis of Placenta Accreta
Placenta accreta is a placenta where the placental villi adhere directly to the myometrium; placenta increta is a placenta where the placental villi invade into the myometrium; and placenta percreta is a placenta where the placental villi invade through the myometrium and into the serosa. About 75% of morbidly adherent placentas are placenta accretas; 18% are placenta incretas; and 7% are placenta percretas.2 The depth of invasion is of clinical importance because the need and type of intervention depend on it. Placenta accretas can be subdivided into total placenta accreta, partial placenta accreta, and focal placenta accreta based on the amount of placental tissue involved in their attachment to the myometrium.
