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((a)–(d)) Contrast-enhanced cerebral MRI showing diffuse enhancement of the left optic nerve at onset ((a), axial T1; (b), coronal T1) and at 2 months followup ((c), axial T1_SE_FSAT; (d) coronal T1_SE_FSAT). ((e)-(f)) Cerebrospinal fluid cytology showing atypical epithelial cells aggregates.
