Two-dimensional image of mobile mass in descending aorta

The two-dimensional image shows the attachment of a mass to the wall of the aorta. Thickening of the posterior wall of the aorta is noted, consistent with an inflammatory process. There is no vessel wall shadowing or calcification, which would have suggested an atherosclerotic process. The evidence of inflammation and a fluid-filled structure posterior to the aortic mass is highly suggestive of vegetation with abscess. The patient was diagnosed with endocarditis after blood cultures grew Staphylococcus aureus.