ABS TRACT Choledochal cysts are congenital cystic dilations of the extrahepatic and/or intrahepatic bile ducts and are rare. Adults with choledochal cysts are at risk of developing biliary carcinoma. Our case is a 31-year-old female patient who presented with right upper quadrant pain. In magnetic resonance imaging/magnetic resonance cholangiopancreatography, there was a fusiform enlargement of the extrahepatic bile duct and cystic duct and it was evaluated as compatible with Type 1 choledochal cyst. Extrahepatic biliary tract excision-cholecystectomy-Roux En Y hepaticojejunostomy procedure was performed. The pathology result was intraductal papillary neoplasm (IPN). IPN is a rare entity in the biliary tract and because it is precancerous, early diagnosis and surgical excision are critical.
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