Carotid atherosclerosis is one of the main risk factors for ischemic stroke. The annual risk of ipsilateral stroke for asymptomatic, albeit severe stenoses is as low as 1 to 2%, but increases to 13% in patients with recent ischemic symptoms. However the risk decreases after the first 2-3 years from the symptomatic episode, dropping to 3%. Echo-color Doppler ultrasonography is the screening method of choice, being highly accurate, noninvasive and low-cost. Carotid angiography still represents the gold standard, however, less invasive techniques as RM angiography and Angio-CT are becoming increasingly common. Based on NASCET, ECST and ACAS results, carotid endarterectomy (CE) is strongly recommended for severe symptomatic stenoses, while for the moderate symptomatic and the severe asymptomatic ones the benefit in terms of stroke risk reduction is modest and surgery should be restricted to selected cases in surgical centers of high experience. For severe asymptomatic stenoses NNT is too high to recommend indiscriminate surgery; we are waiting for the results of ACSRS trial, designed to identify a subset of patients at risk of ipsilateral stroke greater than 4%/y, that may be considered for CE, while patients at low risk will be spared from unnecessary operation. Apart from surgery, in all patients with carotid atherosclerosis correction of cardiovascular risk factors is mandatory. Antiplatelet therapy (ASA alone or with dypiridamole, ticlopidine) is effective in secondary prophylaxis of athero-thrombotic stroke; its use in asymptomatic carotid stenoses can be recommended, even if more because of a plausible rationale than of clinical trial-based evidences.