The prevalence of saccular cerebral aneurysms in the asymptomatic general population has been reported over a wide range (0.2-8.9%) when examined angiographically. Approximately 90% of such aneurysms arise from the anterior circulation, in which ACA / ACoA complex represents ~30-40%.

Portuguese: Este caso ilustra um aneurisma da artéria comunicante anterior identificado incidentalmente em TC de crânio e confirmado por angiorresonância magnética.