Transverse SinusesCranial SinusesSinus Thrombosis, IntracranialLateral Sinus ThrombosisCerebral VeinsOccipital BoneDura MaterSkullPseudotumor CerebriSagittal Sinus ThrombosisMyelitis, TransverseCentral Nervous System Vascular MalformationsSkull BaseMaxillary SinusCerebral AngiographyEchoencephalographyMeningiomaParanasal SinusesColon, TransverseMeningeal NeoplasmsCavernous SinusSinus of ValsalvaMagnetic Resonance AngiographyTomography, X-Ray ComputedCarotid SinusUltrasonography, Doppler, ColorFrontal SinusSphenoid SinusParanasal Sinus DiseasesConstriction, PathologicSkull NeoplasmsSkull Base NeoplasmsMagnetic Resonance ImagingCoronary SinusCerebrovascular CirculationBlood Flow VelocitySkull FracturesEthmoid SinusUltrasonography, Doppler, TranscranialSick Sinus SyndromeSingle-Blind MethodParanasal Sinus Neoplasms