Fig. 1

Routine cerebrospinal fluid findings differentiate patients who later converted to multiple sclerosis at onset of optic neuritis. a Cerebrospinal fluid (CSF) leukocyte count, b distribution of oligoclonal band (OCB) positivity and negativity and c IgG index in multiple sclerosis (MS)-related optic neuritis (ON) (MS-ON), isolated ON (ION), and healthy controls (HC). Open circles indicate four patients that were diagnosed with MS 3 to 12 months after ON onset