Figure 2

Figure 2 : 

A. Intraoperative exploration revealed completely ruptured posteromedial papillary muscle (arrow) in the left atrium. B. Histopathological finding of ruptured papillary muscle. Myocytes show contraction band necrosis, an early histological change in acute myocardial infarction. Note that a dark contraction band (arrow) extends across the myocytes, and the nuclei are not clearly visible in most of the cells. The arrowhead indicates myocytolysis with the infiltration of macrophage (haematoxylin and eosin stain, ×400).