Abstract: Objective To determine the diagnostic effect of magnetic resonance cholangiopancreatography compared with ERCP in the pancreatobiliary disease.Methods 186 cases suspected pancreatobiliary diseases were collected from Jan,1997 to Nov,2004.MRCP alone or MRCP+abdominal MRI should be performed randomly.And then,ERCP within one day.When taking ERCP as the gold standard,it was calculated interms of the sensitivities,specificities,accuracies,positive predictive values,negative predictive values,positive likelilood ratios and negative likelihood ratios.Results Among the 186 cases,the successful cannulation of ERC and ERP was 96.77% and 94.74% respectively.While MRCPs were all successful.The accuracy for MRCP alone and MRCP+abdominal MRI in choledocholithiasis was content.The accuracy in the upper and middle part of bile duct of MRCP alone was 95.65%.The statistic value including accuracy and k value of MRCP+abdominal MRI had been improved to 97.78% and 0.93 respectively.But it's discontented in diagnosing periampulla carcinoma and the begin diseases of pancreas by MRCP alone and MRCP+abdominal MRI.Conclusion MRCP alone has been rather sensitive,specific and accurate in diagnosing biliary diseases.MRCP can replace diagnostic performance of ERCP partially.

Key words: magnetic resonance cholangiopancreatography, endoscopic retrograde cholangiopancreatography, pancreatobiliary diseases