In the Todani classification of choledochal cysts, which type accounts for the majority of cases and consists of fusiform or cystic dilatation confined to the extrahepatic bile duct?
- A Type I ✓
- B Type III
- C Type II
- D Type IVa
Correct answer: A. Type I
Explanation
Todani type I, solitary dilatation of the extrahepatic common bile duct, constitutes roughly 80 to 90 percent of choledochal cysts. Type II is a true diverticulum of the duct, type III is a choledochocele within the duodenal wall, and type IVa denotes multiple intrahepatic plus extrahepatic dilatations. Definitive treatment of type I is complete cyst excision with Roux-en-Y hepaticojejunostomy because of the lifelong risk of cholangiocarcinoma in retained cyst wall.
Reference: Bailey and Love's Short Practice of Surgery, 27th ed.
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