Todani Classification of Choledochal Cyst

Todani Classification of Choledochal Cyst

Type I: Dilatation of extrahepatic biliary duct (Incidence: 80 – 90%)
1a: Cystic
1b: Saccular
1C: Fusiform

Type II: Diverticulum of the Common Bile Duct (Incidence: 2%)

Type III: Choledochocoele involving intraduodenal portion of Common Bile Duct (Incidence: 4 – 5%)
1a: Cystic
1b: Saccular
1C: Fusiform

Type IV: Intra and Extrahepatic Duct Dilatation (Incidence: 10%)
IVa: Intra and Extrahepatic cysts
IVb: Multiple extrahepatic cysts

Type V: Caroli’s Disease (Incidence: Rare)

Reference:

Todani, Takuji, et al. “Congenital bile duct cysts: classification, operative procedures, and review of thirty-seven cases including cancer arising from choledochal cyst.” The American Journal of Surgery 134.2 (1977): 263-269.

Suggested Reading:

Radiology of Biliary Tract – Articl.net

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