Acute aortic dissection is one of the most devastating and time-sensitive diagnosis to consider in young adults with chest pain. Military medicine is represented by a larger proportion of 18- to 50-year-old individuals than is seen in the general medical population. Although uncommon in frequency, younger patients are more likely to suffer from proximal, aortic dissections. Chest radiographs and D-Dimer assays are used frequently as risk stratification tools, but have significant limitations in these more proximal dissections. Because of the frequency and lethality of nonspecific presentations, there exists a need for a sensitive screening tool. This case report presents a 43-year-old male with a concerning history and physical examination for aortic dissection, but a normal portable chest radiograph and a normal D-Dimer assay. It highlights the importance of clinical acumen in developing and maintaining a high clinical index of suspicion based on a Bayesian pretest probability model.
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