“…Spinal MRI is invaluable in identifying the presence of myelitis and allowing for classification into TM and LM. LM is a characteristic finding in NMO/NMOSD and its presence may be used to differentiate from myelitis in classic MS, which rarely extends beyond a single vertebral segment (33). Longitudinal cord involvement has been reported in SLE and SS as well (7,8,14,17,22,23,30,34,35).…”