Atherosclerosis: Fibrous Cap

One stylish-looking artery.

An atherosclerotic artery contains a core of cholesterol/cholesterol esters, macrophages filled with oxidated LDL --> low density lipoproteins (foam cells), and necrotic material (after the foam cells have died). Covering this core is a fibrous cap. The fibrous cap can rupture and release the central core of necrotic material into the artery, resulting in the formation of a thrombus. 

Extreme atherosclerosis is something you want to avoid; it's a shame that fattening foods taste so good.