Placenta accreta: comparison of two uterine sparing techniques. A Randomized multicenter study

INTERVENTION: Group I operated by three step technique which include: 1‐ double ligation of uterine arteries on both sides before and after placental separation 2‐ suturing of placenta bed with 2 quadrable sutures 3‐insetion of triple way foly's catheter group II will be operated by transverse B‐Lynch suture technique CONDITION: Recruitment PRIMARY OUTCOME: operative time, blood loss, success of the technique in preserving the uterus, amount of blood transfusion, intraoperative and postoperative complications, SECONDARY OUTCOME: need for any other interventions, need for ICU, re‐admonitions and re‐operation. INCLUSION CRITERIA: Abnormal placental invasion diagnosed by ultrasound and or MRI Preoperative or intra‐operative diagnosis of placenta accreta patients refusing hysterectomy