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Major localization of IA in the circle of Willis of men and women. In men, IA affects more frequently the anterior cerebral artery (ACA) and anterior communicating artery (AComA; left). In women, IA localizes preferentially on the internal carotid artery (ICA), in particular at the bifurcation with the posterior communicating artery (PComA; right) (MCA, middle cerebral artery; BA, basilar artery; PCA, posterior cerebral artery).
