Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Primary lateral sclerosis ?
    ### Response:
    How is primary lateral sclerosis diagnosed? There is no single test that confirms a diagnosis of primary lateral sclerosis (PLS). Because the disease can mimic signs and symptoms of other neurological diseases such as multiple sclerosis and amyotrophic lateral sclerosis (ALS), several tests are done to rule out other diseases.
    