Angiopathy: Disease of the arteries, veins, and capillaries. There are two types of angiopathy: microangiopathy and macroangiopathy. In microangiopathy, the walls of small blood vessels become so thick and weak that they bleed, leak protein, and slow the flow of blood. For example, diabetics may develop microangiopathy with thickening of capillaries in many areas, including the eye. In macroangiopathy, fat and blood clots build up in the large blood vessels, stick to the vessel walls, and block the flow of blood. Macroangiopathy in the heart is coronary artery disease; in the brain, it is cerebrovascular disease. Peripheral vascular disease is macroangiopathy that affects, for example, vessels in the legs.