Evaluation of sonographic diagnostic criteria for placenta accreta

Purpose. To compare the diagnostic value of reported sonographic criteria for placenta accreta and to develop a composite score system for antenatal evaluation. Method. Sixty‐six women at risk for placenta accreta were examined for 9 cases of placenta accreta that were confirmed at delivery. The performance of previously reported gray‐scale and Doppler sonographic criteria for the diagnosis of placenta accreta was analyzed individually. A composite score system was developed by combining selected sensitive or specific sonographic criteria, and its performance was evaluated. Results. The criteria of obliteration of retroplacental clear space, a myometrial thickness of