Fig 2. A, Simultaneous bilateral external carotid angiography (AP view). B, Left external carotid angiography (lateral view). C, Right external carotid angiography 4.6 months after stage II embolization. Right upper corner shows microcatheter angiography before stage III Onyx embolization (arrowhead, microcatheter tip; arrow, previous Onyx cast; circle, final target). D, Left common carotid angiography 4.6 months after stage II embolization (lateral view). E–F, Poststage III embolization right (E, AP view late venous phase) and left (F, lateral view arterial phase) common carotid angiography show complete resolution of the fistula with preservation of the venous sinuses and obliteration of the left PCA (F, double white arrow), middle meningeal (F, black arrowhead), and occipital supply (F, black arrow). E, double white arrow, Subtracted Onyx cast; E, black arrowhead, Onyx in the transverse sinus leaflet. G and H, (AP view-native images) Onyx cast before (G) and after (H) the third and final embolization. Note that the target area showed on G has been completely filled with the embolic agent on H (white circle).