Dural arteriovenous fistula (DAVF)

DAVF Classification

The two most common classifications for dural AVFs are the Borden and the Cognard classification shown below:

Borden Classification

1. Venous drainage directly into venous sinus or meningeal veins 2. Venous drainage into dural venous sinus wirth CVR 3. Venous Drainage directly into subarachnoid veins (CVR) only

| Type | Features | | --- | --- | | I | DAVF drainage into a dural venous sinus or meningeal veins, with normal anterograde flow. Usually clinically benign. | | II | DAVF draining anterograde into dural venous sinus, but with retrograde flow into cortical veins. | | III | DAVF with direct retrograde flow from fistula into cortical veins, causing venous hypertension. |