Question:
Based on the choledochal cyst appearance in the given image, which Todani type does it most likely represent?
Based on the choledochal cyst appearance in the given image, which Todani type does it most likely represent?
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Todani Classification Breakdown:
- Type I: Extrahepatic only (a: Saccular, b: Segmental, c: Fusiform).
- Type II: Diverticulum of CBD.
- Type III: Choledochocele (within duodenal wall).
- Type IV: Extra + Intrahepatic (IVa) or multiple extrahepatic (IVb).
- Type V: Caroli's disease (Intrahepatic only).
- Type I: Extrahepatic only (a: Saccular, b: Segmental, c: Fusiform).
- Type II: Diverticulum of CBD.
- Type III: Choledochocele (within duodenal wall).
- Type IV: Extra + Intrahepatic (IVa) or multiple extrahepatic (IVb).
- Type V: Caroli's disease (Intrahepatic only).
Updated On: Sep 3, 2026
- Ia
- Ic
- Ib
- II
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The Correct Option is B
Solution and Explanation
Concept:
Choledochal cysts are congenital dilatations of the biliary tree. The Todani classification system categorizes these based on their anatomical morphology and distribution.
Explanation:
• Type I cysts represent 80-90% of all choledochal cysts and involve dilatation strictly confined to the extrahepatic bile duct.
• Type I is further subdivided into three distinct morphological variants:
• Type Ia: Saccular or cystic dilatation of the extrahepatic bile duct.
• Type Ib: Focal, segmental dilatation of the extrahepatic duct.
• Type Ic: Smooth, diffuse, fusiform dilatation of the entire extrahepatic bile duct extending from the pancreaticobiliary junction up to the hepatic confluence.
• Standard examination images representing a diffusely widened, spindle-shaped (fusiform) common bile duct without focal saccular outpouchings are classic for a Type Ic choledochal cyst.
• Type II is an isolated diverticulum protruding from the CBD wall.
Final Answer:
The classic diffuse fusiform dilatation of the extrahepatic bile duct depicted in typical radiology prompts corresponds to Todani Type Ic.
Choledochal cysts are congenital dilatations of the biliary tree. The Todani classification system categorizes these based on their anatomical morphology and distribution.
Explanation:
• Type I cysts represent 80-90% of all choledochal cysts and involve dilatation strictly confined to the extrahepatic bile duct.
• Type I is further subdivided into three distinct morphological variants:
• Type Ia: Saccular or cystic dilatation of the extrahepatic bile duct.
• Type Ib: Focal, segmental dilatation of the extrahepatic duct.
• Type Ic: Smooth, diffuse, fusiform dilatation of the entire extrahepatic bile duct extending from the pancreaticobiliary junction up to the hepatic confluence.
• Standard examination images representing a diffusely widened, spindle-shaped (fusiform) common bile duct without focal saccular outpouchings are classic for a Type Ic choledochal cyst.
• Type II is an isolated diverticulum protruding from the CBD wall.
Final Answer:
The classic diffuse fusiform dilatation of the extrahepatic bile duct depicted in typical radiology prompts corresponds to Todani Type Ic.
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