Salmonella Aortic Aneurysm: Suggestions for Diagnosis and Therapy Based on Personal Experience

Abstract

Infectious aneurysm is a rare event, especially after the introduction of antibiotic therapy. However, its early detection is very important for timely treatment with antibiotics and surgical intervention. This pathology may generally be due to mycotic endocarditis or septic embolization, prevailing in the preantibiotic era, and to aortitis, whose incidence is actually increasing, mainly in subjects with preexisting large-vessel atherosclerosis and intimal defects. This clinical entity is usually defined as microbial arteritis and recognizes Salmonella spp as the microorganism most frequently isolated from blood or vascular tissue cultures. The authors present the case of a 56-year-old man with a history of hypertension that some weeks before admission manifested as hyperpyrexia and episodic lumbar pain, associated with hepatosplenomegaly and with a pulsing mass in the periumbilical region. Abdominal computed tomography (CT) scan documented a voluminous infrarenal aortic aneurysm with a markedly reduced and irregular vessel wall. The patient underwent surgical excision of the aneurysm, during which marked periaortic inflammation phenomena, complete absence of the posterior aortic wall for a length of 5-6 cm, and the exposure of the correspondent vertebral bodies were observed. Histopathologic examination of the aneurysmal tissue showed atheromatous and thrombotic aspects and confirmed strong signs of inflammation. This case may suggest that the occurrence of microbial aortitis, especially from Salmonella spp, should be taken into account in the presence of a septic status associated with back, abdominal, or thoracic pain.

Salmonella-related mycotic pseudoaneurysm

“…A mycotic aneurysm can develop from septic embolization to the vasa vasorum, hematogenous seeding of an existing aneu-rysm, or extension from a contiguous site of infection. 1,2 Mycotic infections of the aorta show a preference for male patients already infected with S enteritidis or S typhimurium. 3 Predisposing factors include rheumatic deformity of the valves, a bicuspid valve, impaired immunity, 4 self-induced or iatrogenic arterial trauma, 5,6 atherosclerotic deposits and calcification of the endovascular structure, 7 and, in elderly patients, Salmonella septicemia.…”