Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Camurati-Engelmann disease ?
    ### Response:
    Camurati-Engelmann disease is a genetic condition that mainly affects the bones. People with this disease have increased bone density, particularly affecting the long bones of the arms and legs. In some cases, the skull and hip bones are also affected. The thickened bones can lead to pain in the arms and legs, a waddling walk, muscle weakness, and extreme tiredness.
    