“…Several examinations are necessary to rule out neurological conditions that may mimic PACNS [2]. Serological tests are generally normal; however, abnormalities such as antinuclear antibodies or intrathecal oligoclonal IgG bands in our patient do not exclude PACNS diagnosis [2,7]. Similarly, MRI may be abnormal in more than 80% of PACNS patients, but this is not specific [2,8,9].…”