Infectious intracranial aneurysms (IIAs) are relatively rare, but associated with comparatively higher morbidity and mortality rates to their other intracranial aneurysm counterparts. The first description of an IIA was published in 1869 and is credited to Church . He presented the case of a 13 year-old boy with mitral valve endocarditis and onset of left hemiparesis that subsequently died from rupture of a right middle cerebral artery (MCA) aneurysm. In 1885, Sir William Osler first used the term mycotic aneurysm to describe a patient with sub-acute bacterial endocarditis, who at autopsy was found to have a ruptured aortic aneurysm. He made comment that the debris visualized within the aortic arch aneurysm seemed similar to that found on the valves of the heart in cases of malignant (mycotic) endocarditis . At the end of the nineteenth century, the misnomer mycotic aneurysm was frequently used to describe any aneurysm resulting from infection, irrespective of the microbial etiology [7, 17, 36]. Its more contemporary term infectious intracranial aneurysm was initially used by Ojemann in 1984  and represents a more accurate and widely accepted denomination.
KeywordsCompute Tomography Angiography Infective Endocarditis Intracranial Aneurysm Parent Artery Mycotic Aneurysm
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