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Intraoperative angiographic findings. A regular wire was easily advanced through the left vertebral artery occlusion site and a 4-Fr diagnostic catheter was advanced distally (A). A 6-Fr guiding sheath with attached dilator was then placed beyond the occlusion site using an exchange method with a long wire (B). The basilar artery thrombus was then removed using an aspiration catheter (C and D).
