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Comparative study of MRC and PTC in diagnosis of malignant biliary obstruction of hepatic hilar

LU Yi zhong,LIU Bin,ZHANG Guo bing,et al.Department of Radiology,the First Affiliated Hospital of Anhui Medical University,Hefei 230022,P.R.China  
Objective:To assess the value of magnetic resonance cholangiography (MRC) and percutaneous transhepactic cholangiography (PTC) in diagnosis of malignant biliary obstruction in hepatic hilar.Methods:Both MRC and PTC were performed in 16 cases with malignant biliary obstruction in hepatic hilar confirmed by pathology and imaging finding,among them there were nine cholangiocarcinomas,4 metastasis (2 colon cancers,1 gallbladder carcinoma,and 1 gastric cancer) and 3 hepatocellular carcinomas.The diameter of the dilated left and right hepatic bile duct and the length of narrowing were measured and the accuracy of MRC and PTC in the evaluation of extent of the narrowing was compared.Paired t test and chi square test were used.Results:There was no significant difference between MRC and PTC in measurement of the diameter of dilated biliary ducts (left: t =1.27, P 0.20 right: t =1.33, P 0.20),but there was significant difference in the evaluation of the length of narrow segments ( t =3.31, P 0.01).In the evaluation of the extent of narrowing,the accuracy of MRC was lower than PTC with great significance too (χ 2=8.50, P 0.005).Conclusion:MRC can well demonstrate the location of the obstruction and extent of dilated bile ducts,but it maybe overevaluate the narrow part. PTC can not only evaluate the extent of the dilated bile duct,but also exactly evaluate the length of narrow segment and the degree of obstruction.
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