Diagnostic value of three-dimensional color power angio in pernicious placenta previa with placenta increta

Objective To investigate the value of three-dimensional color power angio(3D-CPA) in the prenatal diagnosis of pernicious placenta previa(PPP) with placenta increta. Methods The ultrasonographic findings of PPP with placenta increta diagnosed in our hospital by 2D-CDFI and 3D-CPA were reviewed and compared with pathologic histology examination. For each of the two imaging methods, sensitivity, specificity, positive predictive value and prenatal diagnose accordance rate were summarized. Results For 3D-CPA, sensitivity, specificity and positive predictive value were 91.1%, 88.9% and 93.3%, respectively. The results of 3D-CPA were higher than those in 2D-CDFI(sensitivity 76.4%, specificity 66.7%, positive predictive value 81.5% ), and were statistically significant(P<0.05). The diagnose accordance rate of 3D-CPA was statistically higher than that of 2D-CDFI (90.4% vs 73.0%; P<0.05). Conclusions 3D-CPA can display abnormal vascular reconstruction between the placenta and uterine wall from various angles, and is more accurate than 2D-CDFI. 3D-CPA plays an important role in the prenatal diagnosis of PPP with placenta increta. Key words: Ultrasonography; Placenta previa; Placenta accreta