• Xin Chen, Ruiqin Shan, Lianxin Zhao, Qingxu Song, Changting Zuo, Xinjuan Zhang, Shanshan Wang, Honglu Shi, Fei Gao, Tianyi Qian, Guangbin Wang, and Catherine Limperopoulos.
• Department of MR, Shandong Medical Imaging Research Institute, Shandong University, 324, Jingwu Road, Jinan, Shandong, 250021, People's Republic of China.
• Eur Radiol. 2018 Feb 1; 28 (2): 708-717.

ObjectivesTo characterise MRI features of invasive placenta previa and to identify specific features for differentiating placenta percreta (PP) from placenta accreta (PA).MethodsForty-five women with PP and 93 women with PA who underwent 1.5T placental MRI were included. Two radiologists independently evaluated the MRI features of invasive placenta previa, including our novel type of placental bulge (i.e. placental bulge type-II, characterized by placental bulge with distorted uterine outline). Pearson's chi-squared or Fisher's two-sided exact test was performed to compare the MRI features between PP and PA. Logistic stepwise regression analysis and the area under the receiver operating characteristic curve (AUC) were performed to select the optimal features for differentiating PP from PA.ResultsSignificant differences were found in nine MRI features between women with PP and those with PA (P <0.05). Placental bulge type-II and uterine serosal hypervascularity were independently associated with PP (odds ratio = 48.618, P < 0.001; odds ratio = 4.165, P = 0.018 respectively), and the combination of the two MRI features to distinguish PP from PA yielded an AUC of 0.92 for its predictive performance.ConclusionPlacental bulge type-II and uterine serosal hypervascularity are useful MRI features for differentiating PP from PA.Key Points• Placental bulge type-II demonstrated the strongest independent association with PP. • Uterine serosal hypervascularity is a useful feature for differentiating PP from PA. • MRI features associated with abnormal vessels increase the risk of massive haemorrhage.

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