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Fig 1. Schematic representation of a vertebral arteriovenous fistula with steal phenomenon. Arrows represent blood-flow direction. A, Blood flow from both vertebral arteries is directed to the fistula site (double thin arrows). B, Trapping technique with positioning of detachable balloons (arrowheads) proximal and distal to the arteriovenous communication re-establishes normal flow through the basilar artery.
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