Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the stages of Adult Central Nervous System Tumors ?
    ### Response:
    Key Points
                    - There is no standard staging system for adult brain and spinal cord tumors.    - Imaging tests may be repeated after surgery to help plan more treatment.
                
                
                    There is no standard staging system for adult brain and spinal cord tumors.
    