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Imaging studies at follow-up of the patient in Case 7-2. A, Diffusion-weighted image (DWI) shows a new ischemic stroke in the right pons (arrow) 1 week after initial presentation. B, Catheter cerebral angiography 3 months after the initial presentation reveals pseudoaneurysm (lower arrow) at the site of dissection and persistent basilar artery occlusion (upper arrow).
