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Barrow classification of CCFs. Type A (A) CCFs are direct fistulas between the intracavernous ICA and the CS (most common). Type B (B) CCFs are indirect fistulas between meningeal branches of the intracavernous ICA and the CS. Type C (C) CCFs are indirect fistulas between meningeal branches of the ECA and the CS. Type D (D) CCFs are indirect fistulas between both meningeal branches of the intracavernous ICA and meningeal braches of the ECA and the CS.
