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The left internal carotid artery stenosis is classified as a high-grade 80-99% stenosis by the University of Washington criteria (PSV > 125cm/s, EDV >140cm/s) and a high-grade >70% stenosis by the NASCET criteria (ICA/CCA ration >4.)
Based on the data (PSV =736cm/s, EDV = 264cm/s, ICA/CCA = 11.5), the stenosis would likely be closer to 99% than the lower end of the above ranges.
A high-grade >50% left external carotid artery stenosis was seen (not shown.) The right carotid arteries were unremarkable and antegrade flow was observed in both vertebral arteries (not shown.)