AQP4 and sarcoidosis: Immunosuppressive strategies frequently used to treat AQP4-ON, MOG-ON, neuro-sarcoidosis, and CRION include azathioprine, methotrexate, mycophenolate mofetil, rituximab, and infliximab; rescue immunomodulatory therapies - immunoglobulin and plasma exchange - may also be needed [3].