Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Neuroblastoma ?
    ### Response:
    Neuroblastoma is a tumor that develops from a nerve in a child, usually before the age of 5.  It occurs in the abdomen near the adrenal glands, but it can also occur in other parts of the body.  It is considered an aggressive tumor because it often spreads to other parts of the body (metastasizes).
    