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Abstract Placenta previa and previous CS were found to be most important risk factors for placenta accreta. Both gray scale and color Doppler ultrasound were very important in diagnosing placenta accreta to reduce maternal \fetal mortality and morbidity. The aim of this study to evaluate the role of ultrasound and color Doppler in diagnosis of placenta accreta in patients with previous cesarean section This study was an observational prospective study carried out on pregnant women with placenta previa(after 30 weeks gestation) with previous cesarean section recruited from the Obstetrics and Gynecology clinic Shibin El kom teaching hospital. Full history was taken, physical examination and obstetric ultrasound and color Doppler was done prenatally. Gray scale ultrasound criteria included; 1- loss of retro-placental sonolucent zone. 2- Irregular retro-placental sonolucent zone. 3- Thining or disruption of the hypechoic uterine serosa bladder interface. 4- Abnormal placental lacunae. Color Doppler ultrasound criteria included ; 1- Diffuse or focal lacunar flow pattern. 2- Vascular lacks with turbulent flow. 3- Hypervascularity of serosa bladder interface. 4- Markadly dilated vessels over peripheral sub-placental zone. |