CraniotomyElectrodesElectrodes, ImplantedNeurosurgical ProceduresPneumocephalusIon-Selective ElectrodesFrontal BoneSubdural SpaceHematoma, Subdural, AcuteElectroencephalographyTrephiningElectrochemistryBrain NeoplasmsHead Injuries, PenetratingDelayed Emergence from AnesthesiaElectrochemical TechniquesHematoma, SubduralDura MaterIntracranial AneurysmSurgical Fixation DevicesMeningeal NeoplasmsSupratentorial NeoplasmsFrontal SinusStereotaxic TechniquesMeningiomaArachnoid CystsTemporal BoneMicrosurgeryTomography, X-Ray ComputedMagnetic Resonance ImagingMicroelectrodesGlasgow Coma ScaleHematoma, Epidural, CranialEpilepsyHematoma, Subdural, ChronicCerebrospinal Fluid RhinorrheaMonitoring, IntraoperativeCranial Fossa, AnteriorFourth VentriclePotentiometryNeurosurgeryBrain AbscessPostoperative ComplicationsFluorocarbon PolymersHematoceleSurgical InstrumentsGraphiteElectric StimulationBiosensing TechniquesCerebellar DiseasesTreatment OutcomeEquipment DesignVentriculostomySurgical FlapsBrain InjuriesSkull BaseConsciousness MonitorsCranial Nerve NeoplasmsSkull FracturesCerebral CortexBrainCerebral AngiographySubarachnoid HemorrhageAneurysm, RupturedGoldSkull Base NeoplasmsConscious SedationCerebral VeinsIntracranial HemorrhagesDecompression, SurgicalTime FactorsBrain MappingCochlear ImplantsConductometryCraniopharyngiomaSignal Processing, Computer-AssistedCochlear ImplantationBrain DiseasesSkullElectric ImpedanceAnesthesiaAnterior Cerebral ArteryEnzymes, ImmobilizedOrbitRetrospective StudiesCranial Fossa, MiddleNeuroendoscopyIntracranial Hemorrhage, HypertensiveNeuronavigation