stage I perihilar bile duct cancer

Definition of stage I perihilar bile duct cancer
National Cancer Institute

stage I perihilar bile duct cancer

(... PAYR-ee-HY-ler bile dukt KAN-ser)
Cancer has formed in the innermost layer of tissue lining the perihilar bile duct and has spread into the muscle layer or fibrous tissue layer of the perihilar bile duct wall.

Source: NCI Dictionary of Cancer Terms