What is the abnormal implantation of the placenta in the lower portion of the uterus known as?

The abnormal implantation of the placenta in the lower portion of the uterus is known as placenta previa. This condition can lead to complications during pregnancy and delivery, as the placenta may obstruct the birth canal. It is typically classified into different types based on how much the placenta covers the cervix. Management often involves monitoring and, in some cases, cesarean delivery if the placenta remains low-lying close to the due date.