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Modifications of longitudinally extensive transverse myelitis (LETM). Spinal cord MRI: sagittal T2WI of spinal cord from an anti-AQP4 antibody positive patient with NMO A: primary LETM in the upper thoracic cord (arrow) extending from Th1 – 6 (lower limit not shown) B: Fragmentation (small arrows) of the earlier LETM following treatment with high-dose steroids and a new LETM (circle) in the lower cervical cord 3 months later.
