OBJECTIVE:　To　investigate　the　relationships　between　upstream　venous　sinus　stenosis　and　pulsatile　tinnitus　(PT),　and　to　assess　the　correlation　with　diverticulum　growth　and　the　effectiveness　of　stent　implantation.　METHODS:　Patient-specific　geometric　models　were　constructed　using　computed　tomography　venography　images　from　a　patient　with　PT,　with　sigmoid　sinus　diverticulum,　and　with　upstream　transverse　sinus　stenosis,　in　whom　stenting　of　the　upstream　sinus　stenosis　alone　achieved　complete　remission　of　PT.　Computational　fluid　dynamics　simulation　based　on　this　patient-specific　geometry　was　performed　using　commercially　available　finite　element　software　(ANSYS-14)　to　qualitatively　and　quantitatively　compare　the　flow　velocity,　flow　rate,　velocity　vector,　pressure,　vorticity,　and　wall　shear　stress　on　the　affected　side　transverse　and　sigmoid　sinuses,　before　and　after　stent　implantation.　RESULTS:　Stenting　improved　the　flow　direction　and　magnitude.　After　stenting,　the　flow　pattern　became　smoother　and　more　regular.　High-speed　blood　flow　at　the　level　of　the　diverticulum　neck　was　confined　to　a　smaller　area,　and　its　direction　changed　from　approximately　perpendicular　to　the　diverticular　dome　to　the　distal　side　of　the　diverticular　neck.　The　diverticulum　showed　obvious　flow　reduction,　with　decreases　of　80.7%,　68.7%,　96.1%,　and　91.3%　in　peak　velocity,　inflow　rate,　pressure　gradient,　and　peak　vorticity,　respectively.　The　abnormally　low　wall　shear　stress　at　the　dome　of　diverticulum　was　eliminated.　CONCLUSIONS:　Our　findings　strongly　support　a　major　role　of　diverticulum　stenosis　before　in　PT　development　and　suggest　that　such　stenosis　is　a　causative　factor　of　diverticulum　growth.　They　also　confirm　the　effectiveness　of　stent　implantation　for　the　treatment　of　PT.