[Ultrasonographic findings, diagnosis and follow-up of a rare bile duct tumor].

An 81 year old female patient developed obstructive jaundice caused by a tubular villous adenoma of the common bile duct. As her disease progressed, we diagnosed an adenocarcinoma. An endoscopically placed biliodigestive drain had to be replaced by a PTCD. The risk of malignant transformation of common bile duct adenomas is reviewed.