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Introduction: Infectious intracranial aneurysm (IIA, or mycotic aneurysm) is a cerebrovascular complication of infective endocarditis. We aimed to describe the clinical course of IIAs during antibiotic treatment.Methods: We reviewed medical records of persons with infective endocarditis who underwent cerebral angiography at a single tertiary referral center from 2011-2016. Aneurysms were followed with subsequent angiography for bad outcome (growth, rupture or new IIA formation) or good outcome (regression or resolution) until endovascular therapy, aneurysm resolution, or end of observation.Results: Of 618 patients included, 40 (6.5%) had 43 IIAs. Eighteen (42%) aneurysms underwent initial endovascular treatment. Twenty-five unruptured aneurysms were treated with antibiotics alone for a median 36 days (interquartile range (IQR) 9-57). Nine (36%) aneurysms had bad outcome (2 new IIA formation, 7 enlargement) at median 8 days, IQR 1-25. Angiography revealed good outcome in 7 (28%) patients (6 resolution, 1 regression) at median 36 days, IQR 16-49. Two patients had no IIA change after median 27 days, and both underwent endovascular treatment. Seven aneurysms had no angiographic reevaluations but no rupture during clinical follow-up for median 4 days, IQR 3-12. There were no aneurysmal ruptures during observation.Conclusion: IIAs represent a dynamic disease. Only a quarter of IIAs resolve with antibiotics alone.