A 66-year-old woman collapses while shopping and expires suddenly of cardiac arrest. Her past medical history is significant for long-standing type 2 diabetes mellitus. Her relatives note that she had complained of chest heaviness and shortness of breath for the past 2 weeks. Sterile fibrinous pericarditis and pericardial effusion are observed at autopsy. What additional finding would be expected during autopsy of this patient?
Endocardial fibroelastosis Marantic endocarditis Mitral valve prolapse Myocardial infarct