Fig. 1. Proposal for classification of Mirizzi syndrome of 3 types and 3 subtypes. Types: type 1, extrinsic compression of the bile duct; type 2, the cholecystobiliary fistula affects less than 50% of the common bile duct (CBD); and type 3, the cholecystobiliary fistula affects more than 50% of the CBD. Subtypes: A, no associated cholecystoenteric fistula (CEF); B, CEF is present without gallstone ileus; and C, CEF is associated with gallstone ileus.