RESUMEN
Benign tumors of the extrahepatic bile duct are rare. They occur mostly in the common bile duct. Among them, papillomas and adenomas are most common. We experienced a case of villous adenomas in the common bile duct and also in the cystic duct. The ultrasound and the CT scan of the abdomen revealed markedly dilated common bile duct, subtle filling defect, and irregular mass narrowing the lumen of the common bile duct. The cholangiogram demonstrated movable, feathery, and marginated papillary mass with tumors, a broad base, and biopsy of this mass was done through the PTBD. The biopsy specimen showed villous adenoma. Even though it was diagnosed as benign, cholecystectomy and excision with Roux-en-Y hepaticojejunostomy was performed because of the high incidence of recurrences and malignant potential.