Dural arteriovenous fistula (DAVF): Difference between revisions
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(Created page with "= 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...") |
(Cognard Classification image) |
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== Borden Classification == | == Borden Classification == | ||
{| class="wikitable" | |||
!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. | |||
|} | |||
==Cognard Classification== | |||
[[File:Cognard Classification.png|thumb]] | |||
#I Venous drainage into dural venous sinus with antegrade flow | |||
#IIa Venous drainage into dural venous sinus with retrograde flow | |||
# IIb Venous drainage Into dural venous sinus with antegrade flow and CVR | |||
#IIa+b Venous drainage into dural venous sinus with retrograde now and CVR | |||
#IV Type III With venous ectasias of the draining subarachnoid venis | |||
#V Direct drainage Into spinal perimedullary veins (CVR indicates cortical venous reflux) | |||
<blockquote>Presence of cortical venous drainage is the most important determinant of rupture nsk from dural arteriovenous fistula. | |||
The other factors listed have not been convincingly linked to risk of hemorrhage.</blockquote> | |||
[[Category:Vascular Pathology]] | |||
Revision as of 01:03, 16 September 2023
DAVF Classification
The two most common classifications for dural AVFs are the Borden and the Cognard classification shown below:
Borden Classification
| 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. |
Cognard Classification
- I Venous drainage into dural venous sinus with antegrade flow
- IIa Venous drainage into dural venous sinus with retrograde flow
- IIb Venous drainage Into dural venous sinus with antegrade flow and CVR
- IIa+b Venous drainage into dural venous sinus with retrograde now and CVR
- IV Type III With venous ectasias of the draining subarachnoid venis
- V Direct drainage Into spinal perimedullary veins (CVR indicates cortical venous reflux)
Presence of cortical venous drainage is the most important determinant of rupture nsk from dural arteriovenous fistula. The other factors listed have not been convincingly linked to risk of hemorrhage.