Transverse SinusesCranial SinusesSinus Thrombosis, IntracranialLateral Sinus ThrombosisCerebral VeinsDura MaterOccipital BonePseudotumor CerebriSagittal Sinus ThrombosisMyelitis, TransverseCentral Nervous System Vascular MalformationsMaxillary SinusCerebral AngiographyEchoencephalographyColon, TransverseParanasal SinusesMeningiomaCavernous SinusMeningeal NeoplasmsSinus of ValsalvaMagnetic Resonance AngiographyCarotid SinusTomography, X-Ray ComputedUltrasonography, Doppler, ColorFrontal SinusParanasal Sinus DiseasesConstriction, PathologicSphenoid SinusMagnetic Resonance ImagingCoronary SinusCerebrovascular CirculationBlood Flow VelocityUltrasonography, Doppler, TranscranialSick Sinus SyndromeEthmoid SinusSingle-Blind MethodParanasal Sinus Neoplasms