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Case 1 spinal dural arteriovenous fistula (AVF). A: Conventional digital subtraction angiography (DSA) shows AVF (arrow indicates draining vein). B: Intraoperative angiography (IOA) shows AVF consistent with DSA (arrow indicates draining vein). C: After occlusion of the AVF, the AVF and draining vein disappeared in the IOA.
