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Cerebral aneurysms arising at nonbranching sites. An experimental Study
S Kondo1, N Hashimoto, H Kikuchi
1Department of Neurosurgery, Kyoto University Medical School and Hospital, Osaka, Japan.
Stroke
|February 1, 1997
Summary
Cerebral aneurysms can form at nonbranching sites, particularly in the posterior cerebral artery (P1), under conditions causing hypertension. Hemodynamic stress appears to be a key factor in the development of these nonbranching and saccular aneurysms.
Area of Science:
- Neuroscience
- Vascular Biology
- Pathology
Background:
- The origin and pathogenesis of cerebral aneurysms at nonbranching sites remain unclear.
- Cerebral aneurysms are abnormal bulges in the brain's blood vessels.
Purpose of the Study:
- To investigate the development of cerebral aneurysms at nonbranching sites using an animal model.
- To understand the etiological conditions and pathogenesis of aneurysms at nonbranching sites.
Main Methods:
- Cerebral aneurysms were induced in 35 Sprague-Dawley rats by ligating the left common carotid artery and inducing renal hypertension.
- The circle of Willis was examined microscopically 12 months post-induction.
Main Results:
- Aneurysmal bulges at nonbranching sites (proximal posterior cerebral artery, P1) were observed in 19 of 35 rats.
- 30 lesions were identified, including fusiform (22) and saccular (8) aneurysms. P1 vessels enlarged and became tortuous, correlating with aneurysm development, particularly at curvatures.
- Lateral aneurysms were found on the lateral walls of vessel curvatures.
Conclusions:
- Cerebral aneurysms at nonbranching sites and saccular aneurysms at branching sites share similar etiologic conditions.
- Hemodynamic stress is a significant factor influencing the site of aneurysm origin.