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Digital subtraction contrast-enhanced angiograms of the left common carotid artery bifurcation. The internal carotid artery forms a 70-degree angle relative to the external carotid artery (the largest angle in the study series). By North American Symptomatic Carotid Endarterectomy Trial criteria, maximum stenosis measures 40%, located 0.6 cm beyond the bifurcation. Calcification and ulceration are also observed
