Table 1 Modified classification of Mirizzi syndrome

I

Extrinsic compression of the common bile duct by an impacted gallstone

II

Cholecystobiliary fistula secondary to an eroded gallstone involving 1/3 of the circumference of the common bile duct

III

Cholecystobiliary fistula involving 2/3 of the circumference of the common bile duct

IV

Cholecystobiliary fistula comprising the whole circumference of the common bile duct

V

Any type plus a cholecystoenteric fistula

Va

Without gallstone ileus

Vb

With gallstone ileus