Main findings
The women who had pernicious placenta previa in the subsequent pregnancy after first cesarean delivery, had a higher frequency of severe outcomes including placental implantation (47.5%), massive bleeding (55.8%) and hysterectomy (10.4%). The examination of ultrasound combined with MRI improved the prediction of placenta implantation in these patients. Finally, we showed that vascular occlusion had no effect on the occurrence of severe hemorrhage and hysterectomy.