Spinal StenosisInjections, EpiduralEpendymaSpinal CanalSpinal CordDura MaterSyringomyeliaLumbar VertebraeHaversian SystemLaminectomyLidocaineMyelographyAnesthetics, LocalSpinal Cord InjuriesEpidural SpaceDecompression, SurgicalPolyradiculopathySpondylolisthesisCarotid StenosisSemicircular CanalsCauda EquinaAortic Valve StenosisAborted FetusYolk SacLigamentum FlavumRadiculopathyMagnetic Resonance ImagingSubdural EffusionIntracranial HypotensionSpinal FusionEar CanalLumbosacral RegionIntervertebral Disc DisplacementCoronary StenosisSpinal DiseasesSpinal Muscular Atrophies of ChildhoodSpinal Cord CompressionCentral Nervous System Vascular MalformationsSciaticaSpinal Nerve RootsTracheal StenosisTomography, X-Ray ComputedImmunohistochemistryRoot Canal PreparationLow Back PainTreatment OutcomeForeign-Body MigrationSpondylosisCervical VertebraeIntermittent ClaudicationNeurosurgical ProceduresPain MeasurementPyloric StenosisMitral Valve StenosisDisability EvaluationConstriction, PathologicBack PainPulmonary Valve StenosisInjections, SpinalSacrumOrthopedic ProceduresSpinal Cord DiseasesSteroidsFailed Back Surgery SyndromeFollow-Up StudiesProstheses and ImplantsSpineTissue Adhesions