RESUMEN
PURPOSE: An accurate determination of the natural history of a cerebral aneurysm has implications on management. Few risk factors other than female gender and cigarette smoking have been identified to be associated with cerebral aneurysm progression, particularly rapid progression. MATERIALS AND METHODS: This case series and literature review serves to illustrate a relationship between spontaneous carotid occlusion and rapid enlargement of cerebral aneurysms. RESULTS: In our case series, we demonstrated that increased hemodynamic stress on collateral vessels caused by a spontaneous carotid occlusion may contribute to unusually rapid aneurysm growth and/or rupture. CONCLUSION: Spontaneous carotid occlusive disease may be considered a risk factor for rapid cerebral aneurysm progression and/or rupture that may warrant more aggressive management options, including more frequent surveillance imaging in previously treated aneurysms.