A Klatskin tumor, also known as Hilar Cholangiocarcinoma, is a cholangiocarcinoma (cancer of the biliary tree) occurring at the confluence of the right and left hepatic bile ducts.

Bile duct cancer of the upper part of the bile duct is also called Klatskin's tumor. Klatskin's tumors involve the upper part of the bile duct as divides to enter the right and the left parts of the liver. The bile ducts in the liver are called right and left hepatic ducts. The tumor may involve one or both right and left sides of the hepatic ducts as they enter the liver. The hepatic ducts are closely associated with the blood vessels that supply blood to the liver. Klatskin’s tumors are closely associated with liver and as they grow invasion into the blood vessels that supply blood to the liver is often found.

CT scans obtained after patient was lying in right (D and F) and left (E and G) lateral decubitus positions confirm shift and clockwise rotation of liver and portal vein (arrowhead, D), left portal vein (black arrow, E), and gallbladder (arrowhead, F and G). Spleen and retroperitoneal structures have not shifted, including azygos vein (white arrow, E).

Cecal volvulus. Coronal reformatted CT image and axial contrast-enhanced CT scans 

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