Extrahepatic bile duct cancer is an uncommon disease. and few cases are curable by surgery. We report a case of extrahepatic biliary cystadenocarcinoma (BCAC) associated with atrophy of the left hepatic lobe. A 54-year old male was admitted with painless obstructive jaundice and a hepatic palpable mass noticed one month before presentation. https://www.spidertattooz.com/UMA-Sound-Lantern/