Tarlov CystsPeripheral NervesNerve BlockPeripheral Nervous System NeoplasmsNeoplasm InvasivenessMepivacaineAnesthetics, LocalCarcinoma, Adenoid CysticFemoral NerveCranial Nerve NeoplasmsCranial NervesBrachial PlexusAmidesSciatic NervePalatal NeoplasmsMaxillary NerveNervous System NeoplasmsBile Duct NeoplasmsNerve TissuePain, PostoperativePancreatic NeoplasmsSacrumBurns, ElectricCatheterization, PeripheralTibial NeuropathyPerineumAnalgesiaUltrasonography, InterventionalNeuritisBile Ducts, IntrahepaticTrigeminal Nerve DiseasesInfusion PumpsSciatic NeuropathyDiagnostic Techniques, SurgicalCubital Tunnel SyndromeSalivary Gland NeoplasmsLumbosacral PlexusAdjuvants, AnesthesiaSkull Base NeoplasmsTrigeminal NerveAutonomic Nerve BlockAdenocarcinomaLymphatic MetastasisRadiculopathyHepatic Duct, CommonArachnoidLaryngeal NervesGingival Neoplasmsgamma-SynucleinCholangiocarcinomaProstatectomyPrognosisAnalgesia, Patient-ControlledPhantom LimbDexmedetomidineOptic Nerve GliomaFacial NeuralgiaCommon Bile Duct NeoplasmsFrontal SinusitisParotid NeoplasmsCatheterizationSpinal CanalPancreaticoduodenectomyIsoindolesNeoplasm Recurrence, LocalProstateFacial NerveEpidural SpaceRetrospective StudiesPancreatectomyNeoplasm StagingCranial Nerve DiseasesPain MeasurementTriamcinoloneInjectionsProstatic NeoplasmsMagnetic Resonance ImagingImmunohistochemistryLarynxCapsaicinCarcinoma, Pancreatic DuctalNeedlesBupivacaineTreatment OutcomeCarcinoma, Squamous CellMandibular NeoplasmsNerve FibersAmpulla of VaterTumor Markers, BiologicalProstate-Specific AntigenHead and Neck NeoplasmsDura MaterPerioperative PeriodAdenocarcinoma, PapillaryAmbulatory Surgical ProceduresSurvival RateSpinal Nerve RootsBile DuctsKaplan-Meier EstimateClonidine