Table 2 Cognard classification of intracranial DAVF
Type | Venous drainage |
|---|---|
Type I | Anterograde drainage into venous sinus |
Type II | |
 IIA | Venous drainage into dural sinus with retrograde flow |
 IIB | Venous drainage into dural sinus with normal antegrade flow and CVD |
 IIA + B | Venous drainage into dural sinus with retrograde flow and CVD |
Type III | Venous drainage directly into subarachnoid vein (CVD only) |
Type IV | Venous drainage directly into subarachnoid vein with venous ectasia |
Type V | Venous drainage directly into spinal perimedullar veins |