Comparison of diagnostic value of MRI plain scan and DWI for autoimmune pancreatitis / 中国基层医药

ABSTRACT

Objective@#To compare the diagnostic value of MRI plain scan and DWI for autoimmune pancreatitis(AIP).@*Methods@#From March 2016 to April 2017, 82 AIP patients in the Central Hospital of Taiyuan were selected in the research.And 42 healthy volunteers were selected as the control group.All patients received MRI plain scan and DWI examination.The imaging characteristics of AIP were observed and the diagnostic value of the two methods was compared.@*Results@#Among the 82 AIP patients, 42(51.22%) had diffuse pancreatic enlargement, 21(25.61%) in local pancreas, 72(87.80%) in pancreatic duct stricture, 68(82.93%) in common bile duct strictures, 67(81.71%) in false envelopes, and MRI plain scanning with low T1 signal, high T2 signal and delayed enhancement.The lesion was high in DWI, and the ADC was low.The average ADC value [(1.12±0.15)mm2/s] was significantly lower than that of the normal pancreas [(1.87±0.25)mm2/s], and the difference was statistically significant(t=22.295, P<0.05). The positive predictive value of MRI plain scan was 72.36%, the negative predictive value was 81.37%, and the sensitivity was 71.94%.The specificity was 70.52%.The positive predictive value of DWI for diagnosing AIP was 85.48%, the negative predictive value was 89.13%, and the sensitivity was 87.52%.The specificity was 88.49%.At ADC=0.001 13mm2/s, the sensitivity and specificity of DWI for the diagnosis of AIP were 86.9% and 89.2%, respectively, and the AUC was 0.826 (95% CI 0.686-1.804).@*Conclusion@#MRI and DWI manifestations of AIP are characteristic, and the diagnostic efficiency of DWI for AIP is higher than MRI plain scan.