Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Langer-Giedion syndrome ?
    ### Response:
    Langer-Giedion syndrome is a condition that causes bone abnormalities and distinctive facial features. People with this condition have multiple noncancerous (benign) bone tumors called osteochondromas. Multiple osteochondromas may result in pain, limited range of joint movement, and pressure on nerves, blood vessels, the spinal cord, and tissues surrounding the osteochondromas.
    