Neuromyelitis optica (NMO or Devic's syndrome) is a rare demyelinating disease of the CNS that predominantly affects the spinal cord and optic nerves and shares many clinical and radiological features with multiple sclerosis (MS). The association of NMO with autoimmune thyroiditis has been reported very rarely. Early differentiation between NMO and MS is very important because they have different natural courses and treatment regimens.
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