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Salmonella Mycotic Aortic Aneurysm

Imaging findings

CT chest shows an ulcerated, saccular aneurysm of the descending thoracic aorta with surrounding low attenuation and inflammatory stranding. Serial CTs post-stent placement show progressive enlargement of the aneurysm. Blood cultures grew Salmonella enteritidis.

Key takeaways

Salmonella enteritidis is a classic, highly virulent cause of mycotic (infectious) aortic aneurysms. Infection typically occurs via hematogenous seeding of pre-existing atherosclerotic plaque after enteritis. These aneurysms are highly prone to rupture and require aggressive antibiotic therapy and surgical or endovascular repair.

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