Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the treatments for Primary angiitis of the central nervous system ?
    ### Response:
    How might primary angiitis of the central nervous system be treated?  The current treatment recommendation is to start with oral prednisone at a dose of 1 mg/kg per day and cyclophosphamide at a dose of 2 mg/kg per day. Most centers use prednisone and cyclophosphamide for 4-6 months to induce clinical remission, and then taper prednisone off.
    