With MRI,the accurate diagnosis were given in 18 patients,1 given false negative diagnosis,and no false positive diagnosis. As result,the diagnostic sensitivity is 94 7%,the diagnostic specificity is 100%,the accuracy is 98.6%.

• MRI正确诊断18例,假阴性1例,无假阳性,其诊断敏感性为947%25,特异性为100%25,正确诊断率为986%25;