There is growing evidence that psoriasis is a systemic disorder which enhances atherosclerosis and the risk of cardiovascular disease. Epidemiological studies have shown an independent association between psoriasis and atherosclerosis, stroke and coronary artery disease. The main goal of this on-going study is to register data which will enable the identification of new markers of atherosclerosis activity and carotid plaque instability in patients with severe psoriasis.