Multiple SclerosisParaparesisParaparesis, SpasticParaparesis, Tropical SpasticMultiple Sclerosis, Relapsing-RemittingMultiple Sclerosis, Chronic ProgressiveSclerosisHuman T-lymphotropic virus 1HTLV-I InfectionsAmyotrophic Lateral SclerosisEncephalomyelitis, Autoimmune, ExperimentalMagnetic Resonance ImagingTuberous SclerosisSpinal Cord DiseasesParaplegiaDemyelinating DiseasesSpinal CordOptic NeuritisBrainMyelin Basic ProteinScleroderma, SystemicGene Products, taxOligoclonal BandsInterferon-betaMyelin SheathHTLV-I AntibodiesMyelin-Oligodendrocyte GlycoproteinMuscle SpasticitySpastic Paraplegia, HereditaryHematoma, Epidural, SpinalDisability EvaluationDisease ProgressionNeurologic ExaminationProvirusesSpinal Cord IschemiaMyelin ProteinsLaminectomyOligodendrogliaMyelin-Associated GlycoproteinMyelitisReflex, BabinskiNeuromyelitis OpticaCarrier StateMyelitis, TransverseThoracic VertebraeEpidural SpaceSeverity of Illness IndexParalysisSpinal Cord CompressionSkin Diseases, ViralCentral Nervous SystemCerebrospinal FluidMyelin Proteolipid ProteinLeukemia-Lymphoma, Adult T-CellCase-Control StudiesPolyradiculopathyAtrophyMartiniqueAge of OnsetLigamentum FlavumTreatment OutcomeImmunologic FactorsSpinal Cord NeoplasmsDecompression, SurgicalTime FactorsGenes, pXLipomatosisHLA-DR2 AntigenT-LymphocytesFollow-Up StudiesEncephalomyelitis, Acute DisseminatedDeltaretrovirus AntibodiesAortic Aneurysm, ThoracicNervous System DiseasesNerve Fibers, MyelinatedRecurrenceFatigueDisease Models, AnimalDeltaretrovirus InfectionsDiffuse Cerebral Sclerosis of SchilderCuprizoneJamaicaNeopterinLeukocytes, MononuclearPropylene GlycolsDemyelinating Autoimmune Diseases, CNSParesisManihotAxonsTheilovirusBrachial Plexus NeuritisCohort StudiesDeltaretrovirus AntigensHTLV-II InfectionsDepressionRetrospective StudiesViral LoadRisk FactorsSpinal Cord Vascular DiseasesQuestionnaires