ABSTRACT
Abstract: Optic Neuritis (ON) is a condition caused by the inflammation of the optic nerve, causing diminished visual acuity and ocular pain. It is tightly related to Multiple Sclerosis (MS), often being the first demyelinating event. There is a 31% risk of recurrence during the first 10 years after the diagnosis, and 48% of the patients end up being diagnosed with Multiple Sclerosis1. Imaging studies like brain MRI (Magnetic Resonance Imaging) have a critical role in the diagnosis and prognosis of ON, as well as in the recognition of MS.2 The patient is a 11-year-old girl with recurrent ON and past medical history of Acute Disseminated Encephalomyelitis (ADEM) when she was 5 years old. ON diagnosis was based on clinical findings as well as on ophtalmologic, electrophysiologic and imaging studies. The recurrent episodes of ON improved after the use of high dose steroids. Recurrences were observed after titration of the dose, but remission was achieved after adjustment of treatment. During one of the recurrent episodes, blood work was performed to evaluate possible underlying infectious, demyelinating or autoinmmune process. Anti-MOG antibodies were found positive. The patient at the moment is not presenting with any other criteria suggesting MS or Optic Neuromyelitis, but long term follow up is adviced. Key words: Optic neuritis (ON), multiple sclerosis (MS), acute disseminated encephalomyelitis (ADEM), magnetic resonance imaging (MRI), cerebrospinal fluid (CSF), right eye (RE); visual acuity (VA), optic neuromyelitis (ONM)