RadiculopathyMeningeal CarcinomatosisLumbosacral RegionLumbosacral PlexusSacrumSpinal Nerve RootsLumbar VertebraeIntervertebral Disc DisplacementCervical VertebraeSpinal StenosisSpinal CanalInjections, EpiduralCauda EquinaSciaticaEpidural SpaceNerve Compression SyndromesDiskectomyPolyradiculopathyTotal Disc ReplacementElectrodiagnosisLow Back PainSpondylosisSpinal CordSpondylolisthesisIntervertebral DiscLaminectomyLigamentum FlavumSpinal DiseasesSpinal FusionSpinal OsteophytosisPost-Traumatic HeadacheSpinal Cord Compression