Barrow classification of CC-fistulas
Type I: Drainage into meningeal veins, spinal epidural veins or into a dural venous sinus. Normal anterograde flow.
Type II: Drainage into meningeal veins, spinal epidural veins or into a dural venous sinus. Retrograde flow into subarachnoid veins.
Type III: Direct drainage into subarachnoid veins or into an isolated segment of the venous sinus.
References
Classification and treatment of spontaneous carotid-cavernous sinus fistulas. J Neurosurg. 1985 Feb;62(2):248-56
doi:
10.3171/jns.1985.62.2.0248
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