biomedicines Review Spinal Cord Involvement in MS and Other Demyelinating Diseases Mariano Marrodan , María I. Gaitán and Jorge Correale * Neurology Department, Fleni, C1428AQK Buenos Aires, Argentina; mmarrodan@fleni.org.ar (M.M.); migaitan@fleni.org.ar (M.I.G.) * Correspondence: j...