This stock image reveals an orientation view of the arteries of the heart and three enlargments of a portion of a coronary artery revealing the following:..1. Blockage or coronary artery with stent and deflated balloon inserted...2. Inflation of balloon and expansion of stent...3. Deflated balloon removed leaving expanded stent in place. Note that the width of the arterial wall is expanded outwardly to accomodate the hard, compressed plaque formation.