Cognard classification of dAVFs
Type I: Drainage into dural venous sinus with antegrade flow.
Type IIa: Drainage into dural venous sinus with retrograde flow.
Type IIb: Drainage into dural venous sinus with antegrade flow and cortical venous reflux.
Type IIa+b: Drainage into dural venous sinus with retrograde flow and cortical venous reflux.
Type III: Drainage directly into cortical veins.
Type IV: Drainage directly into cortical veins with venous ectasia.
Type V: Spinal perimedullary venous drainage
References
Cerebral dural arteriovenous fistulas: clinical and angiographic correlation with a revised classification of venous drainage. Radiology. 1995;194(3):671-80
doi:
10.1148/radiology.194.3.7862961
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