Open surgery remains the treatment of choice for mycotic abdominal aortic aneurysm (MAAA). However, open surgery for MAAA is often associated with a significant perioperative risk and there have been some reports in which MAAA was successfully treated with endovascular aortic repair (EVAR). We report a case of MAAA treated with EVAR. Gallium scintigraphy was useful in postoperative evaluation of infection. A 61-year-old man presented with back pain. Computed tomography (CT) revealed a 50-mm saccular abdominal aortic aneurysm(AAA). The patient underwent EVAR for symptomatic AAA but developed a high fever 5 days after surgery. Serum C-reactive protein level was elevated and blood culture was positive for Salmonella. Intravenous antibiotics were commenced with a diagnosis of MAAA and the fever and inflammatory parameters subsided with a decrease in the size of the aneurysm. Accumulation of gallium was observed on scintigraphy 1 month after surgery. The patient received intravenous antibiotics for 8 weeks after surgery and was discharged home with oral antibiotics. At 6 months after surgery, accumulation of gallium disappeared. Oral antibiotics were ceased when CT showed disappearance of the aneurysm 9 months after surgery. At present, the patient has been doing well without signs or symptoms of recurrent infection.