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Carotid Artery Stenosis

https://radiopaedia.org/articles/carotid-artery-stenosis

The North American Symptomatic Carotid Endarterectomy Trial (NASCET) demonstrated a conclusive benefit for carotid endarterectomy in patients with symptomatic 70-99% ICA stenosis 2.

NASCET was established by angiographic calculation of ICA stenosis percentage using the following formula:

% ICA stenosis = (1 - [narrowest ICA diameter/diameter normal distal cervical ICA]) x 100