Figure 12b. Superior sagittal sinus dural AVF. (a) Right external carotid angiogram shows a dural AVF with cortical reflux and occlusion of the superior sagittal sinus. (b) Right external carotid angiogram obtained during transarterial sinus embolization shows a microcatheter that has been advanced into the superior sagittal sinus via the right middle meningeal artery (arrows). (c) Right external carotid angiogram obtained after embolization shows obliteration of the AVF.