<unk>  is a severe obstetric complication involving an abnormal superficial attachment of the placenta to the myometrium (the middle layer of the uterine wall). There are three forms of<unk> , distinguishable by the depth of penetration.
The placenta usually detaches from the uterine wall relatively easily, but women that encounter<unk>  during childbirth are at great risk of obstetrical hemorrhage during its removal. This commonly requires surgery to stem the bleeding and fully remove the placenta, and in severe forms can often lead to a hysterectomy or be fatal.<unk>  affects approximately 1 in 2,500 pregnancies.
Placenta accreta
Placenta previa
Placental abruption
Chorioamnionitis
Gestational trophoblastic disease
Instillation abortion
Postpartum hemorrhage
Antepartum haemorrhage