It is a common cause of antepartum hemorrhage. Placenta previa is a potentially life-threatening condition for both mother and infant. As such, antenatal diagnosis is essential to adequately prepare for childbirth. The term "placenta previa" covers a spectrum of anomalies and results from the partial or total insertion of the placenta into the lower uterine segment.
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Placenta previa refers to implantation of the placenta near the internal cervical os. There are different types of placenta previa: partial placenta previa, complete or total placenta previa, marginal placenta previa and low insertion placenta, which are explained below. This is one of the most common obstetric complications, and it can cause postpartum hemorrhage during labor. The incidence of placenta previa is 1 in to 1 in pregnant women with gestational age greater than 20 weeks, the frequency of occurrence with deliveries increases, thus for the nulliparous women, the incidence is 0. The causes of abnormal implantation of the placenta are not really known, but hypotheses are established according to uterine and placental causes. These alter the endometrium or myometrium causing an abnormal implantation of the placenta, such as:.