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This is a retrospective subanalysis of the IntrePED study, which has beenpreviously published (AJNR Am J Neuroradiol 2015;36:108–15).Seven hundred ninety-three patients with 906 treated aneurysms were enrolled. Thirty-six (4.5%) patients had postoperative acute ischemic stroke, 21 of which occurred within 1 week of the procedure. There was no difference in the rate of acute stroke between the anterior and posterior circulations. Stroke rate was 3% in patients with 1 PED, and 7% in those with 2 PEDs. With multivariate analysis, the only variable independently associated with postoperative stroke was treatment of fusiform aneurysms. Among the patients with stroke, 10 (27.0%) died and 26 (73.0%) had major neurologic morbidity. The authors conclude that acute ischemic stroke following treatment of intracranial aneurysms with the PED is an uncommon but devastating complication, with 100% of patients having major morbidity or mortality.