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Longitudinal view of carotid bifurcation with methods of measuring carotid stenosis at angiography
A: narrowest ICA diameter B: normal distal cervical ICA diameter C: estimated original diameter at the site of the most stenosis
CCA: common carotid artery ECA: external carotid artery ECST: European Carotid Surgery Trial ICA: internal carotid artery NASCET: North American Symptomatic Carotid Endarterectomy Trial
