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NCI Dictionary of Cancer Terms

stage 0 perihilar extrahepatic bile duct carcinoma in situ  listen  (... PAYR-ee-HY-ler EK-struh-heh-PA-tik bile dukt KAR-sih-NOH-muh in SY-too)

  Abnormal cells are found in the innermost layer of tissue lining the perihilar extrahepatic bile duct (where the bile duct leaves the liver). These abnormal cells may become cancer and spread into nearby normal tissue.