Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Kaposi Sarcoma ?
    ### Response:
    Key Points
                    - Kaposi sarcoma is a disease in which malignant tumors (cancer) can form in the skin, mucous membranes, lymph nodes, and other organs.    - Tests that examine the skin, lungs, and gastrointestinal tract are used to detect (find) and diagnose Kaposi sarcoma.
    