Current Concept of Cerebral Aneurysms Arising at Nonbranching Sites

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he origin and pathogenesis of cerebral aneurysms arising at onbranching sites are unclear. Some are considered to be elated to tiny branches such as the superior hypophysial artery, ut there is no evidence to relate others to an arterial branch. ntracranial fusiform aneurysms have been considered to be therosclerotic in origin. Several recent reports suggested nontherosclerotic pathologic change could cause fusiform and olichoectatic aneurysm formation, however (4). We summarize he current concept of pathogenesis, imaging studies, natural istory, and treatment modalities of cerebral aneurysms arising t nonbranching sites and discuss when and how these should e treated in the setting of proximal A1 aneurysms.

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