EpendymomaSpinal CordSpinal Cord InjuriesSpinal Cord NeoplasmsInfratentorial NeoplasmsSpinal Cord DiseasesSpinal Cord CompressionSupratentorial NeoplasmsBrain NeoplasmsCerebral Ventricle NeoplasmsSpinal Cord IschemiaInjections, SpinalCauda EquinaSpinal NeoplasmsParaplegiaSpinal Nerve RootsSacrococcygeal RegionCervical VertebraeCentral Nervous System NeoplasmsSpinal NervesMotor NeuronsNeurosurgical ProceduresSpinal Cord RegenerationSiderosisSpinal CanalAnesthesia, SpinalQuadriplegiaThoracic VertebraeMagnetic Resonance ImagingSpinal DiseasesUmbilical CordPosterior Horn CellsRadiotherapy, ConformalLaminectomyFourth VentricleGlioma, SubependymalRats, Sprague-DawleyMedulloblastomaLumbosacral RegionRecovery of FunctionNerve RegenerationAxonsSpinal StenosisGanglia, SpinalAstrocytomaSpinal Cord StimulationLocomotionSpinal Fusion