The Diagnostic Value Of High Resolution Magnetic Resonance Imaging For Intracranial Vertebrobasilar Artery Dissections

Objective:To evaluate the diagnostic value of the High Resolution MRI(HR-MRI)for diagnosing intracranial Vertebrobasilar Artery Dissection Aneurysm(VBDA).Method:Thirty-two patients suspected of having VBDA had examinations of Digital subtracttion angiography(DSA),TOF-MRA,and HR-MRI(including 3D-FIASTA and 3D-T1 FSP GR)in Qilu hospital during June 2015 to June 2016.Compare the imaging features of DSA and HR-MRI,and assess the diagnostic value of HR-MRI for VBDA.All statistical analyses were performed using the Statistic Package for the Social Sciences(SPSS20.0).The kappa analysis was applied for correlation analysis between diagnostic value of DSA and HR-MRI,and a higher Cohen's kappa coefficient meaning more correlation.All reported P were two-sided,and P <0.05 were considered different significantly.Results:Among all 32 patients,26 were diagnosed by DSA,in which aneurysmal dilation(12 of 26)was the most usual angiography pattern of VBDA.And 11 of 26 patients occurred combined pattern,3 of 26 patients showed irregularity.Intimal flaps(27 of 27)and intramural hematomas(17 of 27)were showed as the common characteristic features of VBDA by high resolution MRI(HR-MRI)(27 of 32).The positive predictive value of HR-MRI is 88.9% while the negative predictive value is 60%.Its sensitivity is 92.3%,with specificity 50% and accuracy 84.4%.The Kappa value is 0.45.P values<0.05 Conclusion: HR-MRI has high diagnostic efficiency,and plays an important part in the diagnosis of VBDA,offering clear visualization of wall features,intramural hematomas and the range of VBDA.