<![CDATA[ Background: Klatskin tumor is a rare liver cancer that involves the bile ducts. Its incidence begins to increase over time and is usually only diagnosed in patients who are already at an advanced stage. The annual incidence of klatskin tumors is not more than 1:100,000. Klatskin tumor is suspected based on signs of biliary obstruction, ultrasonography showing a stricture or bile mass, cholangiography with ERCP and MRCP, abnormal liver function tests, and elevated tumor marker CA 19-9. Case Report: A 65-year-old man presented to the hospital with complaints of yellowing of the eyes and body that began one month ago, as well as a lump in the right upper abdomen that had grown larger over the previous five months. Physical examination revealed yellow eyes, and a palpable lump in the upper quadrant of the patient's abdomen. The patient defecates looked like putty and urinates looked like tea. The diagnosis leaded to a klatskin tumor because the results of MRCP showed a mass in the hilar region of the liver that extended to the proximal common bile duct, which described the appearance of a klatskin tumor. There were an increasing CA 19-9 level and liver function tests. Conclusion: Patient has been diagnosed with klatskin tumors, has choledocholithiasis risk factor, supported by appropriate MRCP images and increasing CA 19-9 level ]]>
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