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This report presents a rare case of intrahepatic cholangiocarcinoma (IHCC) arising 28 years after excision of a type IV-A congenital choledochal cyst. The patient underwent excision of a congenital choledochal cyst (Todani's type IV-A) at 12 years of age, with Roux-en-Y hepaticojejunostomy reconstruction. She received a pancreaticoduodenectomy (PD) using the modified Child method for an infection of a residual congenital choledochal cyst in the pancreatic head at the age of 18. She was referred to this department with a liver tumor 22 years later. Left hemihepatectomy with left-side caudate lobectomy was performed and the tumor was pathologically diagnosed to be IHCC. The cause of the current carcinogenesis was presumed to be reflux of pancreatic juice into the residual intrahepatic bile duct during surgery. This case suggests that a careful long-term follow-up is important for patients with congenital choledochal cysts, even if a separation-operation was performed at a young age, and especially after PD.

Intrahepatic cholangiocarcinoma arising 28 years after excision of a type IV-A congenital choledochal cyst: report of a case