Abstract
More than 90 % of all saccular aneurysms arise from bifurcations or appear at the origin of small side branches (percentages are approximate):
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Middle cerebral artery main bifurcation (15–30 %)
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Anterior communicating artery (20–30 %)
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Internal carotid–posterior communicating artery (15 %)
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Basilar tip (5 %)
Rare bifurcation aneurysm locations:
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Internal carotid artery bifurcation (2 %)
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Internal carotid–anterior choroidal artery (1–2 %)
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Pericallosal–callosomarginal artery (2 %)
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Basilar–superior cerebellar artery (2 %)
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Vertebral artery–posterior inferior cerebellar artery (2 %)
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Vertebrobasilar junction (1 %)
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Basilar–anterior inferior cerebellar artery (0.5–1 %)
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Steiger, HJ., Etminan, N., Hänggi, D. (2015). Pathophysiology and Anatomy. In: Microsurgical Brain Aneurysms. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-45679-8_2
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