Below is an instruction from Human. Write a response.
    ### Instruction:
    What to do for Simple Kidney Cysts ?
    ### Response:
    - Simple kidney cysts are abnormal, fluid-filled sacs that form in the kidneys.  - Simple kidney cysts usually do not cause symptoms or harm the kidneys.  - Most simple kidney cysts are found during imaging tests done for other reasons.  - Treatment is not needed for simple kidney cysts that do not cause any symptoms.
    