Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Bile Duct Cancer (Cholangiocarcinoma) ?
    ### Response:
    Tests that examine the bile ducts and nearby organs are used to detect (find), diagnose, and stage bile duct cancer. Procedures that make pictures of the bile ducts and the nearby area help diagnose bile duct cancer and show how far the cancer has spread. The process used to find out if cancer cells have spread within and around the bile ducts or to distant parts of the body is called staging.
    