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| Comparison of MRI and Color Doppler Ultrasonography in the Diagnosis of Placenta Previa in the Posterior Wall of Late Pregnancy |
| XIAO Qing, PAN Xiao-qin, TANG Liang |
| Department of Ultrasound, the Third People's Hospital of Mianyang, Mianyang ,Sichuan 621000, China |
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Abstract 【Objective】To explore the diagnostic value of MRI and color Doppler ultrasonography in placenta previa posterior wall of uterus in late pregnancy.【Methods】A retrospective analysis was made of 64 cases of placenta previa on the posterior wall of the uterus in late pregnancy from February 2015 to February 2017. Color Doppler ultrasonography was the first choice before operation. For suspected placenta previa patients, the results of cesarean section were used as pathological diagnostic criteria and the diagnostic accuracy of two kinds of detection was evaluated. 【Results】All the patients were confirmed by surgery and pathology. Among the 64 cases of placenta previa, 35 (54.69%) cases were of central type, 9 (14.06%) cases were of partial type, 11 (17.19%) cases were of marginal type, and 9 (14.06%) cases were of low type. The accuracy of MRI in the diagnosis of placenta previa in the posterior wall of the uterus in the third trimester was 98.44%, and only 1 case was misdiagnosed, that is, partial misdiagnosis was central type. The diagnostic accuracy of color doppler ultrasound was 95.31%, and 3 cases were misdiagnosed, among which 2 cases were borderline misdiagnosed as central type and 1 case was partially misdiagnosed as central type. The accuracy of MRI in the diagnosis of placenta previa in the posterior wall of the uterus in the third trimester was slightly higher than that of color doppler ultrasound, but the difference was statistically significant (P>0.05). 【Conclusion】In the clinical diagnosis of placenta previa via the posterior wall of the uterus in the third trimester of pregnancy, color doppler ultrasound is the first choice for detection, and MRI can be performed for those suspected of placenta previa when necessary. The two diagnostic techniques have high accuracy in the diagnosis of placenta previa via the posterior wall of the uterus in the third trimester of pregnancy.
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Received: 02 May 2018
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2019, Vol. 36 
