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stage I perihilar extrahepatic bile duct cancer (... PAYR-ee-HY-ler EK-struh-heh-PA-tik bile dukt KAN-ser)
|Cancer has formed in the innermost layer of the wall of the perihilar extrahepatic bile duct (where the bile duct leaves the liver) and has spread into the muscle and fibrous tissue of the wall.|