Immunoglobulin G4 related pancreaticobiliary disease: Report of two cases highlighting the diagnostic criteria

Two cases of immunoglobulin (IgG4)-related biliary and pancreaticobiliary disease are reported to define its diagnostic features. Case 1 presented with obstructive jaundice and showed IgG4-related disease (RD) involving right and left hepatic duct, common bile duct and gallbladder. Case 2 presented as periampullary mass. Both patients underwent surgical intervention. However, certain clinical and radiological features were present in these cases indicative of the possibility of IgG4-RD.