Fig 1. Magnetic resonance cholangiopancreatography images of a patient with IgG4-related sclerosing cholangitis who showed obstructive jaundice.

(a) An image obtained before corticosteroid (CS) initiation showing both intrapancreatic and diffuse intrahepatic biliary strictures with a serum total bilirubin (TB) level of 11.1 mg/dL. Accordingly, endoscopic biliary drainage was considered ineffective. (b) An image obtained 2 months after CS initiation showing cholangiopancreatographic improvement. The serum TB level decreased to 2.1 mg/dL, without symptoms of biliary tract infection.