@lmmaldonado TM is in the spinal cord. It will "light up" with the contrast in an MRI. Treatment in my experience was steroids during the active stage meaning when the disease is active and causing demyelination. Once the damage is done and the disease goes dormant the dye won't show much. Treatment at that time was not medication in my experience. It was PT, OT and strength training. There may be newer treatments now.