Background: Devic’s syndrome or neuromyelitis optica (NMO) is an autoimmune, inflammatory and demyelinating uncommon clinical entity characterized by the presence of clinical, imagining and laboratory evidence of optic neuritis, acute myelitis with longitudinal injury in more than three spinal segments and finally, NMO IgG seropositive for antibodies specific for the aquaporin channel 4. Case: We report a 28 years old woman diagnosed with multiple sclerosis 14 months ago, who consulted to emergency of Hospital Universitario San Jorge from Pereira by progressive reduction of strength in lower extremities and unrinary retention with duration of five days. She had a history of bilateral optic neuritis in treatment