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stage 0 perihilar bile duct cancer (carcinoma in situ)

(... PAYR-ee-HY-ler bile dukt KAN-ser (KAR-sih-NOH-muh in SY-too))
Abnormal cells are found in the innermost layer of tissue lining the perihilar bile duct. These abnormal cells are not actually cancer but may become cancer and spread into nearby normal tissue. Stage 0 is also called high-grade dysplasia.
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