Journal Information
Vol. 84. Issue 4.
Pages 522-524 (October - December 2019)
Vol. 84. Issue 4.
Pages 522-524 (October - December 2019)
Scientific letter
Open Access
Thrombosis of an infrarenal aortic aneurysm secondary to Salmonella enteritidis infection
Trombosis de aneurisma aórtico infrarrenal secundario a infección por Salmonella enteritidis
I. García-Fernández-Bravoa,
Corresponding author

Corresponding author. Calle Bravo Murillo 53. Código postal: 28003, Madrid, Spain.
, A. González-Muneraa, L. Ordieres-Ortegaa, D. Ruiz Chiribogab, M. González-Leytec
a Servicio de Medicina Interna, Hospital General Universitario Gregorio Marañón, Madrid, España
b Servicio de Angiología y Cirugía Vascular, Hospital General Universitario Gregorio Marañón, Madrid, España
c Unidad de Radiología Vascular, Servicio de Radiodiagnóstico, Hospital General Universitario Gregorio Marañón, Madrid, España
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Acute gastroenteritis after egg ingestion is the most frequent manifestation of Salmonella enteritidis (S. enteritidis) infection. However, invasive pathology, such as the formation of aortic aneurysms due to invasion of the endothelium, is rare.

We present herein a case of acute gastroenteritis due to S. enteritidis complicated by the formation of a previously unknown infrarenal aortic aneurysm, in turn, associated with complete arterial thrombosis of the aneurysm, with the consequent acute arterial ischemia. To the best of our knowledge, the present case of arterial thrombosis associated with an aneurysm infected by Salmonella is the first to be described in the literature.

A 57-year-old man had a history of mild chronic obstructive pulmonary disease (COPD) and was under treatment with glycopyrronium bromide.

He sought medical attention at the emergency service due to paresthesia and the inability to walk of 48-h progression. In the days beforehand, he had presented with symptoms of acute gastroenteritis after eating eggs, that included vomiting, greenish diarrhea with up to 18 bowel movements daily, fever of 38°C, and general malaise.

Upon his arrival at the emergency service, the patient presented with blood pressure of 181/118mmHg, heart rate of 118 bpm, and temperature of 35.4°C. Physical examination revealed peripheral hypoperfusion in both lower limbs, with livedo reticularis up to the pelvis. Laboratory test results showed hemoglobin 15mg/dL, leukocytes 5.9-10.70×103/L, creatinine 2.45mg/dL, creatine kinase 20,000 U/L, sodium 140 mEq/L, potassium 5.5 mEq/L, pH 7.15, pCO2 44mm Hg, pO2 98mm Hg, and lactic acid 10.1mg/dL.

With the suspicion of acute arterial ischemia, a contrast-enhanced abdominal computed tomography (CT) scan was carried out that showed dilation of the aneurysm and complete thrombosis of the infrarenal abdominal aorta (Fig. 1). Anticoagulation with low-molecular-weight heparin was begun and emergency right axillobifemoral bypass was performed (Fig. 2). Immediate postoperative progression was good. Empiric antibiotic therapy was started with meropenem and vancomycin. Multi-sensitive serogroup D Salmonella was isolated in blood cultures and the antibiotic was downscaled to 4 weeks of treatment with ceftriaxone 2g daily.

Figure 1.

Thrombosed infrarenal aortic aneurysm.

Figure 2.

Axillobifemoral bypass.


Daily fever peaks persisted despite the antibiotic therapy. Infection of the vascular stent was suspected and so a positron emission tomography (PET-CT) scan and a scintigram with analogous leukocytes labeled with HMPAO-Tc99m were carried out, through which infection at the level of the bypass was ruled out.

Acute gastroenteritis due to Salmonella spp. is the most frequent manifestation of infection caused by that Gram-negative bacillus. Invasive disease due to S. enteritidis is 6 times more frequent than other causes of bacterial gastroenteritis and is more frequent in persons above 60 years of age and in children.1

As in the case presented herein, the formation of mycotic or infected aneurysms is a rare manifestation of systemic infection and requires the combination of antibiotic therapy and aggressive surgical debridement as initial treatment.2,3

Iatrogenic arterial injury or that caused by intravenous drug injection, active infection (such as pneumonia, spondylodiscitis, or buccal infection), immunosuppressive factors, atherosclerosis, and infection secondary to a pre-existing aneurysm are the outstanding risk factors for the formation of infected aneurysms.

In the present case, there was no previous diagnosis of aortic aneurysm, despite the fact that the patient's age and sex put him in the at-risk population. However, the patient did not present with any risk factor related to his superinfection.

The rare complication of thrombosis of an aortic aneurysm that occurred in the present case should be underlined. Despite the fact that the surgically extracted thrombus was not cultured, the hyper-acute clinical manifestation of arterial ischemia in both lower limbs and the rapid positivity of the blood cultures led us to suppose the coexistence of the two events and the probability that the Salmonella infection was the cause of the formation of the thrombus.

The diagnosis was made through the rapid growth of ciprofloxacin-resistant serogroup D Salmonella in the blood cultures, enabling early directed treatment and antibiotic therapy adjustment to be carried out, even before the emergency axillobifemoral bypass procedure.

The most frequent clinical feature of a superficial infected aneurysm, when there is fever of unclear origin, is a mass that is painful and pulsatile upon palpation, associated with elevated acute-phase reactants in the laboratory analysis. In the case of a deep-seated infected aneurysm, diagnosis tends to be made through a CT or PET-CT scan, as occurred in the present case.4–6 The location of the aneurysm is important for patient outcome, and the infrarenal location has a higher survival rate.

Because there are no randomized studies on the different types of possible treatments for infected aneurysms, management recommendations are based on clinical experience and case series reported in the literature.

Standard treatment consists of antibiotic therapy combined with surgical debridement, with or without associated immediate or deferred revascularization. Endovascular techniques are currently emerging as alternative treatment in high-risk surgical patients.7–9In cases of thrombosed mycotic aneurysms, antibiotic treatment should be added to the anticoagulant and/or interventionist management. As empiric antibiotic therapy, the combination of vancomycin to cover methicillin-resistant Staphylococcus aureus and ceftriaxone, fluoroquinolones, or piperacillin-tazobactam to cover Gram-negative bacteria is recommended.10 Optimum treatment duration is uncertain and should be individualized, depending on immune status, location, and the causal microorganism. In many studies, a minimum of 6 weeks of parenteral treatment is recommended, before the later decision on long-term antibiotic therapy, albeit said duration can vary and in some cases is indefinite.9

Finally, after a prolonged hospital stay of 2 months with numerous complications, the patient described herein was afebrile after completing 8 weeks of endovenous antibiotic therapy and control blood cultures were negative. He was released from the hospital, maintaining anticoagulant treatment, but with no need to continue oral antibiotic therapy.

Ethical disclosures

The authors declare that both verbal and written informed consent was obtained from the patient described in the article for his participation in the study, the handling of his personal data, and the publication of the images. The study was also approved by the hospital ethics committee.

Financial disclosure

No financial support was received in relation to this article.

Conflict of interest

The authors declare that there is no conflict of interest.

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Please cite this article as: García-Fernández-Bravo I, González-Munera A, Ordieres-Ortega L, González-Leyte M. Trombosis de aneurisma aórtico infrarrenal secundario a infección por Salmonella enteritidis. Revista de Gastroenterología de México. 2019;84:522–524.

Copyright © 2019. Asociación Mexicana de Gastroenterología
Revista de Gastroenterología de México

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