Epidural SpaceCatheters, IndwellingAnesthesia, EpiduralCathetersNeedlesInjections, EpiduralDura MaterSpinal CanalLigamentum FlavumAnalgesia, EpiduralCatheterizationLumbosacral RegionEpidural NeoplasmsLipomatosisAnalgesia, ObstetricalRadiculopathySpinal Nerve RootsCatheterization, Central VenousLumbar VertebraeCoccyxFluoroscopyThoracic VertebraeTissue AdhesionsFiber Optic TechnologyMyelographySpinal DiseasesAnesthesia, ObstetricalAnesthetics, LocalInjections, SpinalSpinal CordMathematical ConceptsIntracranial HypotensionLaminectomyCentral Venous CathetersIntervertebral Disc DisplacementSpinal Cord CompressionBlood Patch, EpiduralEpidural AbscessSpinal NeoplasmsAnesthesia, CaudalCardiac CathetersCatheterization, PeripheralAnatomy, Cross-SectionalUrinary CatheterizationBupivacaineFentanylTomography, X-Ray ComputedUrinary CathetersCervical VertebraeEquipment FailureEndoscopyNerve BlockLidocaineSpinal Cord DiseasesMagnetic Resonance ImagingSpinal StenosisLow Back PainCatheter-Related InfectionsTreatment OutcomeSteroidsEquipment DesignPregnancy Trimester, ThirdSwine