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Table 2: 
 Cognard classification of DAVFs¹³
Type Venous Drainage Flow Pattern  in Sinus CVD
“Benign” 
    I Dural sinus Antegrade No
    IIa Dural sinus Retrograde No
“Aggressive” 
    IIb Dural sinus Antegrade Yes
    IIa+b Dural sinus Retrograde Yes
    III Cortical vein Yes
    IV Cortical vein Yes + venous  ectasia
    V Cortical vein with spinal  perimedullary drainage Yes

Type	Venous Drainage	Flow Pattern in Sinus	CVD
“Benign”
I	Dural sinus	Antegrade	No
IIa	Dural sinus	Retrograde	No
“Aggressive”
IIb	Dural sinus	Antegrade	Yes
IIa+b	Dural sinus	Retrograde	Yes
III	Cortical vein		Yes
IV	Cortical vein		Yes + venous ectasia
V	Cortical vein with spinal perimedullary drainage		Yes