الفهرس 
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Abstract
Placenta previa is an obstetric complication that occurs in the second and third trimesters of pregnancy. It may cause serious morbidity and mortality to both the fetus and the mother. It is one of the leading causes of vaginal bleeding in the third trimester. Placenta previa exists when the placenta is inserted wholly or in part into the lower segment of the uterus. It is classified by ultrasound imaging according to what is relevant clinically: if the placenta lies over the internal cervical os, it is considered a major previa; if the leading edge of the placenta is in the lower uterine segment but not covering the cervical os, minor or partial previa exists. Placenta previa complicates approximately 5 of 1,000 deliveries. The maternal mortality rate secondary to placenta previa is approximately 0.03%. The great majority of deaths are related to uterine bleeding and the complication of disseminated intravascular coagulopathy. Babies born to women-with placenta previa tend to weigh less than babies born to women without placenta previa. The risk of neonatal mortality is higher for placenta previa babies compared with pregnancies without placenta previa. The exact etiology of placenta previa is unknown. The condition may be multifactorial and is postulated to be related to multiparity, multiple gestations, advanced maternal age, previous cesarean delivery, previous abortion and possibly and smoking. The aim of the work was to evaluate the perinatal and maternal outcome of major degree placenta previa at mansoura university main hospital.