Figure 9.

Histopathology of the acute, subacute, and chronic myocardial infarctions. The acute myocardial infarction exhibited inflammatory cell infiltration and intramyocardial hemorrhage (arrowheads, top panel). The subacute myocardial infarction contained early collagen protein and granulation tissue (white arrowheads, middle panel). Large, thick-walled blood vessels were detected in the peri-infarct regions of the subacutely infarcted myocardium (black arrowheads, middle panel). Remodeled vessels with varying sizes were frequently observed in the case of chronic scar infarction (black arrowheads, bottom panel).