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What's the classification system for DAVF?
Borden Classification
Grade I = drains to sinus or meningeal vein
Grade II = drain to sinus with venous reflux
Grade III = drain to cortical veins only
I = observe (II and III treat)
Cognard Classification
Grade I = into sinus with anterograde flow
Grade IIa = into sinus with retrograde flow
Grade IIb = into sinus with anterograde flow and cortical venous reflex
Grade III = into cortical veins only
Grade IV = into cortical veins only with venous ectasia
Grade V = into spinal permimedullary vein
I observe, IIa treat if symptomatic, IIb, III-V treat
Formula for estimation of carotid stenosis in NASCET and ECST
CCF classification
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