“…Risk of any ipsilateral neurological deficit increases with the severity of the asymptomatic CAS. Published annual risk of ipsilateral neurological deficits for asymptomatic CAS <50%, between 50 and 80% and >80% are 0–3.8%, 2–5% and 1.7–18%, respectively (table 2) [3, 12, 18, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44]. The majority of these neurological deficits seems transient neurological attacks (TIAs) or amaurosis fugax, but risk of ipsilateral stroke or permanent neurological deficit must not be underestimated and can affect up to half of these patients.…”