Aortic atherosclerosis. Coloured frontal computed tomography (CT) scan of a section through the abdomen of a 57-year-old patient, showing narrowing (stenosis) of the abdominal aorta (vertical, centre) caused by a build up of fatty plaques (atheroma, white patches). Here, this condition, known as atherosclerosis, has led to arterial hypertension (high blood pressure).