Diagnosis of placenta previa and placenta implantation
In the present study, placenta previa was diagnosed by ultrasound and/or magnetic resonance (MRI) examination during the regular follow-up no matter whether the placenta reached, or partially or completely covered the opening of the endo-cervix. The final diagnosis of placenta previa was confirmed during the cesarean surgery.
The placenta implantation was predicted by ultrasound and/or MRI, or determined directly if it was difficult to remove during the operation, together with subsequent pathological examination.