Fig 8.

Images of this patient with the classic MR imaging findings of a DAVF on T1-weighted contrast-enhanced (A) and T2-weighted (B) scans demonstrate a vast network of dural collateral arteries in the shunting zone. Although the main supply to the shunt is derived from the radiculomeningeal artery originating from the injected segmental artery (arrowhead), there is an additional supply ascending from a lower segmental artery (small arrow) that is filled via longitudinal collaterals. The shunting zone is denoted by an asterisk. Only if the liquid embolic agent penetrates into the draining veins will this patient be cured; a proximal occlusion will invariably lead to refilling of the shunt via dural collaterals.