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Table 1 Types of biliary dilatation in the Todani classification

From: Todani type III: like biliary dilatation with duodenal prolapse—a case report

Classification

Anatomic features of the bile duct

Type I

 Type Ia

Cystic dilatation of the common bile duct

 Type Ib

Segmental expansion of the common bile duct without an anomalous pancreaticobiliary junction

 Type Ic

Diffuse or cylindrical dilatation of the common bile duct with an anomalous pancreaticobiliary junction

Type II

Diverticulum type in the whole extrahepatic duct

Type III

Choledochocele located in the duodenal wall which is frequently associated with an ampullary obstruction

Type IV

 Type IVA

Multiple cysts in both the intrahepatic and extrahepatic

bile ducts

 Type IVB

Multiple dilatations confined only to the extrahepatic bile duct

 Type V

Single or multiple dilatations of the intrahepatic bile duct (Caroli’s disease)