A Klatskin tumour, also known as a hilar cholangiocarcinoma, is a type of biliary tree cancer that develops where the proper and left hepatic bile ducts meet. Gerald Klatskin, who described 15 cases of cholangiocarcinoma and listed a few features for it in 1965, is credited with giving the condition its name. Klatskin tumour is the most common cancer that bureaucracy has inside the place in which the left and proper hepatic ducts join simply outside the liver, and paperwork the not unusual place hepatic duct. A biliary tree cancer called a Klatskin tumour or (hilar cholangiocarcinoma) is seen where the appropriate left and right hepatic bile channels converge. This condition is named in honour of Gerald Klatskin, who recorded 15 instances and discovered several characteristics of this kind of cholangiocarcinoma in 1965. It combines just outside the liver, where the Klatskin tumour develops. The most prevalent subtype, representing over 50% of all cholangiocarcinomas, is the perihilar form (Klatskin tumour). It begins above the confluence of the cystic duct with the secondary branches of the right and left bile ducts and is linked to chronic bile duct inflammation. Adenocarcinoma, which develops in the proximal, middle, and distal (third) portions of extrahepatic ducts, is the term for cancer of the bile ducts outside the liver.