Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Ollier disease ?
    ### Response:
    Ollier disease is a disorder characterized by multiple enchondromas, which are noncancerous (benign) growths of cartilage that develop within the bones. These growths most commonly occur in the limb bones, especially in the bones of the hands and feet; however, they may also occur in the skull, ribs, and bones of the spine (vertebrae).
    