Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Potocki-Shaffer syndrome ?
    ### Response:
    Potocki-Shaffer syndrome is a disorder that affects development of the bones, nerve cells in the brain, and other tissues. Most people with this condition have multiple noncancerous (benign) bone tumors called osteochondromas. In rare instances, these tumors become cancerous.
    