Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Severe intellectual disability-progressive spastic diplegia syndrome ?
    ### Response:
    Severe intellectual disability-progressive spastic diplegia syndrome is a rare condition that has been described in a few people with severe intellectual disability . Other signs and symptoms include progressive microcephaly (very small head); ataxia (lack of coordination); spasticity; and/or skin, hair and mild facial anomalies.
    