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Angiography of the left carotid artery with sagittal T1 MR imaging scan of a 54-year-old man with left fronto-insular epilepsy (probable). Angiography shows an arteriovenous malformation fed by the left middle cerebral artery and a left supraclinoid internal carotid artery aneurysm. MR imaging scan reveals the arteriovenous malformation centered on the left frontal operculum with mass effect on the anterior short gyrus of the insula.
