Epidural SpaceAnestheticsAnesthetics, LocalAnesthesia, EpiduralAnesthetics, InhalationNeedlesInjections, EpiduralDura MaterSpinal CanalLigamentum FlavumAnesthetics, GeneralAnalgesia, EpiduralLumbosacral RegionAnesthetics, IntravenousLidocaineEpidural NeoplasmsIsofluraneHalothaneBupivacaineAnesthesia, ObstetricalAnalgesia, ObstetricalSpinal Nerve RootsRadiculopathyLipomatosisLumbar VertebraeCoccyxAnesthetics, CombinedEnfluraneThoracic VertebraeFiber Optic TechnologySpinal DiseasesNerve BlockFentanylMyelographyTissue AdhesionsSpinal CordInjections, SpinalLaminectomyMethyl EthersMathematical ConceptsIntracranial HypotensionFluoroscopyIntervertebral Disc DisplacementSpinal Cord CompressionBlood Patch, EpiduralAnesthesiaEpidural AbscessSpinal NeoplasmsAnesthetics, DissociativePropofolAnesthesia, CaudalAnesthesia, LocalAnatomy, Cross-SectionalCatheterizationMethoxyfluraneAnesthesia, GeneralAnesthesia, InhalationCervical VertebraeBenzocaineTomography, X-Ray ComputedKetamineAnesthesia, DentalEndoscopyTetracaineSpinal StenosisLow Back PainSpinal Cord DiseasesSteroidsNitrous OxidePrilocaineMagnetic Resonance ImagingThiopentalEtomidateProcaineEtherPregnancy Trimester, ThirdPentobarbitalAnesthesiologyDibucaineMepivacaine