Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Spastic diplegia cerebral palsy ?
    ### Response:
    Spastic diplegia cerebral palsy is a form of cerebral palsy, a neurological condition that usually appears in infancy or early childhood and permanently affects muscle control and coordination. Affected people have increased muscle tone which leads to spasticity (stiff or tight muscles and exaggerated reflexes) in the legs.
    