IgG4‐related sclerosing cholangitis, a mimicker of the cholangiocarcinoma: A case report

An 83‐year‐old‐male patient presented with obstructive jaundice, whose imagings were consistent with the cholangiocarcinoma of the distal common bile duct. The tumor markers were within normal limits. IgG4 level was raised; therefore, IgG4‐sclerosing cholangitis was made as the provisional diagnosis. Steroid therapy was started to which he responded well. IgG4‐sclerosing cholangitis should be considered as one of the differentials of suspected cholangiocarcinoma to prevent unnecessary surgical interventions.