An infected aortic aneurysm is evaluated by computed tomography (CT) following presentation on plain film in the emergency room. The importance of CT in delineating the location and cause of the aneurysm is noted. Other modes of evaluation of infected aortic aneurysms are reviewed and discussed. The advantages of CT evaluation are noted. A literature review notes plain film presentation of only one other infected aortic aneurysm. Pathological correlation with the CT imaging is presented.