• perivascular enhancement and anti-MOG antibody

A 47-year-old man had a fever of 39℃, weight loss and night sweat 4 months before admission. Two months later he presented with diplopia, and developed gait disturbance another month later. He was admitted because of disturbed consciousness with a Mini-Mental State Examination score of 24. Brain MRI with fluid-attenuated inversion recovery findings on admission showed bilateral asymmetric high intensity with partial mild swelling on white matter, corpus callosum, cerebellum and brainstem (figure 1A, B). Enhanced MRI detected punctate and curvilinear enhancement suggestive of perivascular infiltration and nodular enhancement (figure 1C, D). A cerebrospinal fluid analysis showed a cell count of 11 cells/µL (mononuclear cells: 94%), an elevated protein level (101 mg/dL). The oligoclonal bands were negative. IgG index was 0.5.