Brain MRI and Cerebral MR Venography FindingsBrain MRI findings of the participants are summarized in Table 2. Forty patients (71%) in Group 2 and 29 patients (78%) in Group 3 displayed marked stenosis in the mid-lateral portion of both TS, whereas 54 patients in Group 1 had normal appearance of TS or unilateral TS stenosis on cerebral MRV. Moreover, 24 (22%) of headache patients with abnormal CSF pressure pulsations and high CSF pressure had normal appearance of TS or unilateral TSS (Figure 2). Whereas, controls had no abnormal pressure pulsations with pressures below 200 mm H2O and normal appearance of TS or unilateral TSS on MRV (Table 2).