Abstract: objective: To explore MRI signs and diagnostic value of MRI for placental adhesive disorders before and after interventional therapy.Methods: From Jan 2009 to Apr 2012,28 patients with placental adhesive disorders treated by embolization received MRI examination and compared with the results of operation and/or clinical diagnosis.The MRI findings before and after interventional therapy were retrospectively analyzed.Results: On MRI images,the placenta demonstrates a heterogeneous signal,isointense to myometrium.the myometrium become quite thin and it can be difficult to visualize in patients with placenta percreta.On Gadolinium-enhanced T1WI,the placental tissue invaded the myometrium in the shape of “garland” or “nodul”.MRI features of all patients by interventional therapy after three or twelve months showed that the placental tissue was confluent with the uterine wall and the myometrium demonstrates a heterogeneous signal.Conclusion: MRI can display the placental implantation site and myometrial invasion degree of placenta implantation;it has an important reference value and can accurately evaluate curative effect before and after interventional therapy to placental adhesive disorders.