Presentation
Incidental finding on CT scan for trauma.
Patient Data
On selected images of a non-contrasted brain CT it is observed an hyperattenuating nodule in anterior arterial topography, hinting at the floor of the third ventricle. This probably represents an aneurysm and an additional study was suggested.
Selected images of MRI study showing: Anterior communicating artery saccular aneurysm.
Normal variant of the anterior cerebral artery (ACA) noted which shows absence of the left A1 segment. There is also a fetal origin of the left posterior cerebral artery (PCA).
Case Discussion
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.
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