[Comparative study between magnetic resonance cholangiopancreatography and endoscopic retrograde cholangiopancreatography in the diagnosis of the pancreatic and biliary obstruction].

BACKGROUND: The endoscopic retrograde cholangiopancreatography and magnetic resonance cholangiopancreatography were methods used for diagnosis of the diseases in the biliary and pancreatic ducts. AIM: Compare the diagnostic concordance among, analyzing sensitivity, specificity, positive predictive value, negative predictive value and accuracy. PATIENTS/
METHODS: There were 41 patients in the studied group, divided in two groups: I--without biliary or pancreatic tract obstruction, and II--with obstruction. Group II was further divided in A--obstruction due to lithiasis, and B--due to other causes.
RESULTS: Concordance between the two methods was found in 67% in group I and 82% in group II. Sensitivity of endoscopic retrograde cholangiopancreatography was 94% and magnetic resonance cholangiopancreatography was 89%. Specificity of endoscopic retrograde cholangiopancreatography was 100% and magnetic resonance cholangiopancreatography was 67%. Magnetic resonance cholangiopancreatography positive predictive value was 93%, the negative predictive value was 50% and the accuracy was 85%.
CONCLUSION: Both methods showed the same sensitivity.