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Letter to the Editor

consensus that one subtype of relapsing-remitting demyelinating disease, neuromyelitis optica (NMO, Devic’s disease), should be recognized as being a separate entity. Clinically, the principal distinguishing feature of NMO is that the neurological findings are essentially restricted to the optic nerves and spinal cord, both at the onset and throughout follow-up, which is most unusual in MS, where cognitive, brainstem and cerebellar involvement