Abstract
Intracranially, saccular (berry) aneurysms predominate. They are round or lobulated focal eccentric protrusions that usually arise from arterial bifurcations and occasionally arise directly from the walls of nonbranching arteries. An aneurysm may have a narrow neck or arise from a broad-based opening that connects to the parent vessel. Saccular aneurysms develop at the point where the tunica media is congenitally thin or absent and the internal elastica of the arterial wall is extremely fragmented or absent. They develop and expand over time, and hemodynamic stress plays an important role in their formation and growth. Rinne and Hernesniemi estimated that the risk of metachronous aneurysm formation in patients with previous subarachnoid hemorrhage (SAH) is approximately 2 or 3 times larger than risk in the general population [33].
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Kurihara, N. (2011). MR Imaging of Cerebral Aneurysms. In: Takahashi, S. (eds) Neurovascular Imaging. Springer, London. https://doi.org/10.1007/978-1-84882-134-7_12
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