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Longitudinally extensive transverse myelitis (LETM) is a syndrome that involves three or more vertebral segments in the spinal cord lesion, and it is one of the characteristic features of neuromyelitis optica (NMO) differentiating it from multiple sclerosis. Many studies proved the importance of aquaporin-4 (AQP4) antibody, which plays a vital role in the pathogenesis of NMO. Recent reports suggest...
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