Spinal StenosisSpinal CanalLigamentum FlavumCauda EquinaLumbar VertebraeMyelographyLaminectomySpinal Cord CompressionPolyradiculopathyDecompression, SurgicalCervical VertebraeSpondylosisIntervertebral Disc DisplacementSpinal Cord DiseasesSpinal CordLumbosacral RegionRadiculopathySpinal FusionMagnetic Resonance ImagingSpinal Nerve RootsSpinal Cord InjuriesCarotid StenosisSemicircular CanalsAortic Valve StenosisThoracic VertebraeSpinal DiseasesNerve Compression SyndromesEar CanalLow Back PainCoronary StenosisSpinal NeoplasmsTomography, X-Ray ComputedBrown-Sequard SyndromeSpondylolisthesisTreatment OutcomeTracheal StenosisSpinal FracturesSpinal NervesSpinal Cord NeoplasmsEpidural SpaceSpineRoot Canal PreparationInjections, SpinalPyloric StenosisDura MaterMitral Valve StenosisConstriction, PathologicPulmonary Valve StenosisLongitudinal LigamentsInternal FixatorsSacrumArnold-Chiari MalformationNeurosurgical ProceduresAnesthesia, SpinalRoot Canal IrrigantsSpinal InjuriesDental Pulp CavityIntervertebral DiscBack Pain