Cerebral VentriculitisVasospasm, IntracranialSubarachnoid HemorrhageBasilar ArteryCerebral VentriclesCerebral ArteriesEncephalitisHydrocephalusVentriculostomyIschemic Attack, TransientCerebral AngiographyCisterna MagnaSpiruridaCerebrovascular CirculationCerebral VentriculographyCerebrospinal Fluid ShuntsCerebral InfarctionIntracranial AneurysmPapaverineVentriculoperitoneal ShuntCerebrospinal FluidMiddle Cerebral ArteryMeningitisCoronary VasospasmInjections, IntraventricularMeningitis, FungalAneurysm, RupturedCerebral PalsyBrain AbscessNimodipineMeningitis, BacterialBrainTuberculosis, MeningealBrain IschemiaUltrasonography, Doppler, Transcranial