Diagnostic value of MRI in placenta accreta / 实用放射学杂志

ABSTRACT

Objective To investigate the diagnostic value and imaging characteristics of MRI in the placenta accreta of patients with retained placenta.Methods Archieves of patients with retained placenta confirmed by clinical pathology were reviewed,with focus on imaging findings of MRI,including location of and signal intensity of placenta attach,hematometra,presence and absence of placenta accreta,signal intensity of retained placenta,shape,margin and border of retained placenta.The imaging characteristics were analysized with blindness and compared between patients with and without placenta accreta.Diagnostic value of MRI and ultrasound for the placenta accreta of patients with retained products of conception was assessed.Results There was no significant difference between the two groups of MRI characteristics except that the edge of the placenta was not clear.The sensitivity,specificity,accuracy,positive predictive value and negative predictive value for the evaluation of placenta accreta by MRI and ultrasound were 93.8% vs 56.3%,90.9% vs 90.9%,92.6%vs 70.4%,0.94 vs 0.9,0.91 vs 0.59,respectively;there were significant differences between MRI and ultrasound for sensitivity, specificity and negative predictive value.Conclusion M RI is substantially better than ultrasound for the diagnosis of placenta accreta. The unclear placenta edge and signs of placental infiltration of the myometrium are the basis for MRI diagnosis of placenta accreta.