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| The prenatal MRI features and diagnostic value of pernicious placenta previa complicated with placenta accreta |
1.Foshan Maternal and Child Health Hospital, Foshan Guangdong 528000, China; 2.Department of Radiology,
the Second Affiliated Hospital of Shantou University Medical College, Shantou Guangdong 515041, China |
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Abstract Objective: To investigate the prenatal MRI features and diagnostic value of placenta accreta. Methods: The prenatal MRI findings and clinical and pathological data of 72 patients with pernicious placenta previa were retrospectively analyzed. The prenatal MRI imaging manifestations and its diagnostic value were evaluated. Results: ①The sensitivity and specificity of MRI in the diagnosis of placenta accreta, placenta increta and placenta percreta were 50% and 91.7%, 79.2% and 91.7%, 80% and 100%, respectively.②The sensitivity and specificity of MRI manifestations in the evaluation of placenta increta were 67.3% and 85%(loss of placental-myometrial interface), 65.4% and 75%(heterogeneous signal in placenta), 50% and 85%(abnormal placental vascularity), 40.4% and 95%(low signal bands on T2WI), 17.3% and 100%(abnormal uterine bulging), and 26.9% and 95%(“tents” shape change or nodular protuberance of the bladder wall). ③The depth of placenta increta was positively related with the volume and occurred probability of low signal bands on T2WI. Conclusion: MRI technique is of great value in diagnosis of placenta increta and percreta. But the sensitivity in diagnosis of placenta accreta is too low. The most useful signs of placental invasion are loss of placental-myometrial interface, abnormal placental vascularity, low signal bands on T2WI, abnormal uterine bulging, and “tents” shape change or nodular protuberance of the bladder wall. The larger size of low signal bands on T2WI, the deeper placental invasion would be.
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Received: 10 September 2015
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2016, Vol. 27 
