ABSTRACT
Colour transvaginal ultrasonography was used to diagnose 100 cases of suspected placenta previa in early second trimester. Eight out of the twenty cases had multiple sonolucent areas inside the placental tissue. Two of them were dropped during the follow up period. Doppler study of the blood flow inside these lacunae proved characteristic pulsatile lacunar flow pattern. Also blood flow in the main uterine artery was studied using colour Doppler and S/D ratio, that was significantly lowered in cases with lacunar blood flow. At delivery, 3 cases had cesarean hysterectomy, 2 cases had cesarean section with bilateral uterine artery ligation, and one only had cesarean section. The placenta of the first five cases was proved to be accreta. Blood transfusion was mandatory in all six cases. We recommend preparation of blood transfusion at delivery time, in a well equiped hospital, in all cases of placenta previa with lacunar blood flow, because it may predict placenta accreta, with extensive bleeding after delivery