Transverse SinusesCranial SinusesSinus Thrombosis, IntracranialLateral Sinus ThrombosisCerebral VeinsDura MaterOccipital BonePseudotumor CerebriSagittal Sinus ThrombosisMyelitis, TransverseCentral Nervous System Vascular MalformationsMaxillary SinusCerebral AngiographyEchoencephalographyColon, TransverseParanasal SinusesMeningiomaMeningeal NeoplasmsCavernous SinusSinus of ValsalvaMagnetic Resonance AngiographyCarotid SinusUltrasonography, Doppler, ColorTomography, X-Ray ComputedFrontal SinusParanasal Sinus DiseasesConstriction, PathologicSphenoid SinusMagnetic Resonance ImagingCoronary SinusCerebrovascular CirculationBlood Flow VelocityUltrasonography, Doppler, TranscranialSick Sinus SyndromeEthmoid SinusSingle-Blind MethodParanasal Sinus Neoplasms