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A. A 54-year-old man with history of acute myocardial infarction (MI) had an anteroseptal transmural MI. On day 3, the patient went into severe congestive
heart failure and died on day 10. Note the markedly thinned transmural anteroseptal infarct (arrowheads) involving 60% of the basal slice of the heart. The
anteroseptal region shows infarct expansion. B. A 47-year-old man presented with chest pain, elevated creatine kinase (CK) and creatine kinase
myocardial band (CK-MB), and a non–Q-wave MI involving the posterior wall of the left ventricle on electrocardiogram (ECG). The patient had an
uneventful hospital course with cardiac enzymes (CK-MB) falling close to baseline. On hospital day 3, he developed another episode of chest pain with an
increase in cardiac enzymes and new ECG changes of ST-segment elevation in precordial leads. The patient was diagnosed with infarct extension and
Source: Chapter 57. Pathology of Myocardial Ischemia, Infarction, Reperfusion, and Sudden Death, Hurst's The Heart, 13e
right ventricular infarction. The ventricular slice shows an older subendocardial infarct with hyperemic border (arrowheads) and a more recent infarction
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ventricle (arrows). C. A 51-year-old man presented with chest pain of longer than 24 hours' duration. A diagnosis of acute MI involving the inferior wall of
the left ventricle and a right atrial infarction was made. Note the hemorrhagic right atrial border and that the tip is pale and dusky; the surface shows fibrin
deposits on the pericardial surface. Reproduced with permission from Virmani R, Burke AP, Farb A, Atkinson J, eds. Cardiovascular Pathology. Vol 40,