To　investigate　the　effect　of　different　types　of　transverse　sinus　stenosis　on　blood　flow　patterns　in　the　ipsilateral　superior　curve　of　the　sigmoid　sinus.According　to　the　morphology　of　transverse　and　sigmoid　sinus　sections　in　pulsatile　tinnitus　patients,　ten　idealized　models　with　different　degrees　and　positions　of　transverse　sinus　stenosis　were　constructed.　Computational　fluid　dynamics　simulations　were　performed　to　compare　the　hemodynamic　characteristics　among　these　models.　Follow-up　images　of　previous　cases　were　included,　which　preliminarily　confirmed　the　hypothesis　that　bone　plate　erosion　of　the　sigmoid　sinus　sulcus　is　related　to　blood　flow　impingement.Blood　flow　impingement　on　the　superior　curve　of　the　sigmoid　sinus　wall　intensified　with　increasing　degree　of　stenosis　and　decreased　with　increasing　distance　between　the　stenosis　and　the　sigmoid　sinus.　The　impact　zone　was　generally　confined　to　the　anterior　and　lateral　walls　of　the　superior　curve　of　the　sigmoid　sinus.　When　the　stenosis　was　located　far　from　the　middle　of　the　transverse　sinus,　the　blood　flow　impingement　on　the　sigmoid　sinus　wall　was　very　weak.When　stenosis　is　located　far　from　the　sigmoid　sinus,　the　causes　of　tinnitus　should　be　comprehensively　considered　instead　of　assuming　that　stenosis　is　the　main　cause.　Bone　plate　erosion　of　the　sigmoid　sinus　sulcus　was　promoted　by　blood　flow　impingement.•　Ten　idealized　models　with　different　degrees　and　positions　of　stenosis　were　constructed.　•　The　causes　of　pulsatile　tinnitus　should　be　comprehensively　considered.　•　Sigmoid　sinus　plate　dehiscence　was　promoted　by　blood　flow　impingement.