* Placental addition is a pathology that develops against the background of the normal location of the placenta in the uterus or on the anterior and posterior walls, and at the same time pathological growth of the myometrium occurs through the placenta into the uterus.*
*As a result, membranes may be exposed. When the placenta grows through the posterior wall, the fetal cephalopodial fossae are revealed. In this case, cysts form in the placenta. Sometimes they can be visible below the junction of the pelvis with the posterior surface of the uterus.* *The second feature of the pathology is the strengthening of decidua cells (special structural elements of the inner layer of the decidua), which grow.