RESUMO
Objective To explore the diagnostic value of ultrasonography and magnetic resonance imaging (MRI) in placenta accreta.Methods Totally 150 pregnancy women in Hunan Provincial Maternal and Child Health Care Hospital from January 2015 to December 2016 were selected into the clinical data.According to the location of the placenta in the uterus,150 pregnancy women were divided into the anterior (n =80) and posterior (n =70) groups.The sensitivity,specificity,positive predictive value and negative predictive value of ultrasound and MRI were calculated.The sonographic and MRI features between placenta implantation and non placental implantation were compared.Results There were no statistically significant difference for ultrasound and MRI sensitivity (96.43％ vs 85.71％,P =0.89),specificity (88.46％ vs 96.15％,P =0.37),positive predictive value (81.82％ vs 92.31％,P =0.95) and negative predictive value (97.87％ vs 92.59％,P =0.42) in anterior group.The MRI sensitivity (96.67％ vs 66.67％,P＜0.01),positive predictive value (96.67％ vs 83.33％,P ＜ 0.01) and negative predictive value (97.50％ vs 78.26,P ＜0.01) in the posterior group were higher than those in the ultrasound.Ultrasound showed that the incidence of localexpansion of the uterus and the increased placental vessels in placenta accreta was higher than that in non placental accreta (x2 =26.92,26.83,and 63.77,P ＜ 0.01).MRI showed that the incidence of local swelling,increased placental vascularity and low T2 signaling rates in placenta accreta was higher than that in non placental accrete (x2 =23.75,17.46,18.86,P ＜ 0.01).Conclusions Ultrasonography and MRI has high diagnostic value in placenta accreta.MRI is superior in the diagnosis of placenta accreta in the posterior uterus than in the anterior uterus.
