Figure 19.

 (A) Segment of coronary artery with a stent in place and embedded in GMMA, sectioned with a special lathe, surface polished, and stained with haematoxylin and eosin. This stent was in place for two weeks. The stent struts (arrows) and their relation to the vessel wall are seen. A minimal tissue reaction is seen focally. (B) This intracoronary stent was in place for seven weeks and was processed in the same manner as the stent in panel A. The stent struts are well placed and a good lumen is still evident. A circumferential tissue reaction is seen. Atherosclerotic plaque, blood clot (C), and calcification (P) are also seen.