Fig. 10

A 46-year-old man with no significant medical history presents with abdominal pain and low-grade fever. (a) An axial CT abdomen post-contrast image demonstrates ill-defined fat stranding (arrow) surrounding the proximal abdominal aorta at the level of the celiac artery origin. (b) A follow-up axial post-contrast CT scan of the abdomen performed 3 days later for worsening abdominal pain shows an interval increase in the severity of periaortic fat stranding (arrows). (c) A further follow-up axial post-contrast CT scan of the abdomen 1 week later shows the development of a saccular aortic aneurysm (*) with worsening periaortic fat stranding (arrows). The patient underwent surgical excision of the mycotic aneurysm with bypass grafting, and the excised aortic wall grew S. aureus. Despite surgical intervention, the patient died in the early postoperative period. Ao = abdominal aorta