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Chronic relapsing inflammatory optic neuropathy is a form of recurrent optic neuritis that is steroid responsive. Patients typically present with pain associated with visual loss. CRION is a diagnosis of exclusion, and other demyelinating, autoimmune, and systemic causes should be ruled out. Early recognition is crucial given risks for severe visual loss and because it is treatable with immunosuppressive treatment such as steroids. Relapse that occurs after reducing or stopping steroids is a characteristic feature.
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