An arterial disease characterized by the development of lipid plaques in the inner lining of the artery. The lipid sediments are accompanied by local inflammatory processes and by accelerated division of muscle and connective tissue cells; the final result is a plaque narrowing the lumen of the arterial vessel and diminishing the amount of blood that can pass through it at any given time. The clinical effects secondary to the existence of such a plaque in an artery can range from total absence of symptoms, through an expected and gradual clinical manifestation (development of Angina Pectoris in stress situations only) and up to a violent and unexpected event of heart attack.