An axial CT image shows a saccular aneurysm (arrowheads) arising from the infrarenal abdominal aorta (arrow), with periaortic soft tissue attenuation and fat stranding. Infected aortic aneurysm was confirmed at surgery.
Facts
- It is a consequence of infectious aortitis with wall being weak and ruptured forming a false lumen or pseudoaneurysm
- Most common location = infrarenal aorta
- Most common causative agent = Salmonella
- Route of infection = hematogenous, contiguous seeding, traumatic/iatrogenic inoculation
- Mycotic = infection not confined only to fungus (use of mycotic aneurysm can be misleading)
Imaging
- Aneurysm mostly saccular
- Aneurysm size ranging from 1-10 cm
- Around aneurysm: gas, soft tissue stranding, fluid
- Can be confused with neoplasm, infected lymph nodes or hematoma
Reference:
Restrepo CS, Ocazionez D, Suri R, Vargas D. Aortitis: imaging spectrum of the infectious and inflammatory conditions of the aorta. RadioGraphics 2011;31:435-451.
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