Salmonella enterica serotype Brandenburg is one of the more uncommon serotypes isolated from patients with gastroenteritis. Few cases of extraintestinal infections with serotype Brandenburg have been documented. The first case of a serotype Brandenburg-dependent thigh abscess originating from an atherosclerotic pseudoaneurysm of the femoral artery is reported.
CASE REPORTDuring a medium-distance flight, a 57-year-old male Caucasian pilot suddenly experienced sharp pain in his right thigh followed by fever. The patient had hypercholesterolemia and non-insulin-dependent diabetes mellitus regulated by diet. In addition, he had previously experienced mild claudicatio intermittens in his right leg and had thus been prescribed acetylsalicylic acid. On the following day, he was seen by his general physician, who found no signs of deep venous thrombosis and prescribed diclofenac for symptomatic relief. During the subsequent week, the thigh swelling increased and the fever persisted. Five days after the initial symptoms, a tender nonfluctuating mass measuring 10 by 15 cm was found in the right thigh adjacent to the groin. A fine-needle puncture of the mass yielded blood only. A week later, magnetic resonance tomography of the thigh showed an extensive swelling surrounded by soft-tissue edema ( Fig. 1A and B). A pseudoaneurysm of the right femoral artery with extensive collateral circulation was identified by intravenous angiography (Fig. 1C). Empirical antibiotic therapy with difloxacillin (750 mg three times orally) was initiated. However, the patient's condition deteriorated with expansion of the soft tissue mass and persistent fever. The patient was admitted to the hospital. On admission, the leukocyte count was 16.6 ϫ 10 9 /liter with a predominance of neutrophils, the erythrocyte sedimentation rate and C-reactive protein level were 84 mm/h and 160 mg/liter, respectively, and the hemoglobin level was 124 g/liter. Liver and renal function tests were normal. Therapy with intravenously administered cefuroxime was initiated, after which the fever disappeared; however, the soft tissue mass remained unchanged. Three weeks after onset of symptoms, an abscess in the thigh muscles with close connection to the femur was incised and drained of pus. The patient's condition improved rapidly after the surgical intervention. Culture of pus from the abscess revealed growth of Salmonella species strain O4. Bone scintigraphy showed no pathological uptake in the femur or elsewhere in the skeleton. The patient was treated with oral levofloxacin for 3 months with no signs of recurrent infection. Interestingly, 2 weeks prior to the onset of disease, our patient had been to Tunisia, where he had experienced transient gastrointestinal discomfort without diarrhea or fever.The bacterial organism was isolated from the abscess fluid after 4 days of incubation using aerobic flasks with liquid medium (BacT/Alert; Organon Teknika). The isolate was subcultured onto supplemented human blood agar plates containing Columbia II agar, L-cysteine, hemin,...