Craniotomygamma-Aminobutyric AcidAnalgesicsCyclohexanecarboxylic AcidsBrain NeoplasmsBrain InjuriesBrain ChemistryNeurosurgical ProceduresAminesPneumocephalusNeuralgiaFrontal BoneAnticonvulsantsHematoma, Subdural, AcuteBrain MappingNeuralgia, PostherpeticTrephiningMagnetic Resonance ImagingBrain AbscessAcute PainHead Injuries, PenetratingFibromyalgiaBrainHematoma, SubduralDelayed Emergence from AnesthesiaIntracranial AneurysmPain MeasurementDura MaterSupratentorial NeoplasmsBrain EdemaSurgical Fixation DevicesMeningeal NeoplasmsFrontal SinusArachnoid CystsMeningiomaSubdural SpaceEpilepsies, PartialDiabetic NeuropathiesMicrosurgeryGlasgow Coma ScaleTomography, X-Ray ComputedStereotaxic TechniquesVisceral PainTreatment OutcomeHematoma, Epidural, CranialDouble-Blind MethodHematoma, Subdural, ChronicAnalgesics, Non-NarcoticCerebrospinal Fluid RhinorrheaTemporal BoneOxycodoneFourth VentricleCranial Fossa, AnteriorNeurosurgeryPainBrain StemDose-Response Relationship, DrugPain ThresholdBrain IschemiaFees, PharmaceuticalSurgical InstrumentsHematocelePostoperative ComplicationsRats, Sprague-DawleyCerebellar DiseasesVentriculostomySurgical FlapsSkull BaseSubarachnoid HemorrhageConsciousness MonitorsCerebral AngiographyCerebral VeinsCranial Nerve NeoplasmsSkull FracturesCerebral CortexToxicity Tests, AcuteTime FactorsHyperalgesiaAneurysm, RupturedTramadolSkull Base NeoplasmsConscious SedationCranial Nerve InjuriesAnalgesics, OpioidPain, PostoperativeDecompression, SurgicalAdjuvants, PharmaceuticThiophenesIntracranial HemorrhagesNeuronsCraniopharyngiomaDrug Therapy, CombinationCerebral HemorrhageMustard PlantTrigeminal NeuralgiaIntracranial PressureAnterior Cerebral ArteryNeurotoxicity SyndromesMediodorsal Thalamic NucleusOrbit