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40071 Pathology

A 62-year-old man with a history of hypertension is brought to the emergency room with severe left chest and back pain. His blood pressure is 80/50 mm Hg. Physical examination shows pallor, diaphoresis, and a murmur of aortic regurgitation. An ECG does not show myocardial infarction. An X-ray film of the chest reveals mediastinal widening. Which of the following is the most likely diagnosis?

ABacterial endocarditis
BDissecting aneurysm
CPericarditis
DPulmonary thromboembolism
Pathology
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