Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Troyer syndrome ?
    ### Response:
    Troyer syndrome is a neurological disorder and one of the many types of hereditary spastic paraplegia. Signs and symptoms typically begin in early childhood and may include progressive muscle weakness and stiffness (spasticity) in the legs; muscle wasting in the hands and feet; paraplegia; leg contractures; developmental delays; speech difficulty; mood swings; and short stature.
    