All brain MR and MR venographies were analyzed by the same neuroradiologist, who were blinded to each patient's history. We classified the transverse sinus (TS) stenosis (TSS) as present or absent. TSS was considered present when the signal flow was poor or lacking (flow gap) in the mid-lateral portion of the transverse sinus (unilateral TSS) or in both transverse sinuses (BTSS)