Liver Abscess, AmebicEpidural SpaceAbscessBrain AbscessLiver AbscessAnesthesia, EpiduralEpidural AbscessAbdominal AbscessNeedlesLung AbscessInjections, EpiduralDura MaterSpinal CanalLigamentum FlavumPsoas AbscessAnalgesia, EpiduralLumbosacral RegionEpidural NeoplasmsLiver Abscess, PyogenicLipomatosisRadiculopathySpinal Nerve RootsLumbar VertebraeCoccyxRetropharyngeal AbscessAnalgesia, ObstetricalPeriapical AbscessSpinal DiseasesThoracic VertebraeMyelographyTissue AdhesionsPeritonsillar AbscessFiber Optic TechnologyAnesthesia, ObstetricalLaminectomyMathematical ConceptsIntracranial HypotensionSpinal CordSpinal Cord CompressionFluoroscopyIntervertebral Disc DisplacementTomography, X-Ray ComputedBlood Patch, EpiduralAnesthetics, LocalInjections, SpinalSpinal NeoplasmsAnesthesia, CaudalAnatomy, Cross-SectionalCatheterizationDrainageFentanylSubphrenic AbscessCervical VertebraeMagnetic Resonance ImagingPeriodontal AbscessSpinal Cord DiseasesBupivacaineEndoscopySpinal StenosisSuppurationLow Back PainLidocaineSteroids