Mycotic aneurysms leading to aortoduodenal fistula (ADF) are associated with high morbidity and mortality. We report a patient with a mycotic aneurysm and ADF who required emergency laparotomy. After excision of the aneurysm, vascular reconstruction was performed using an autologous graft. The left long saphenous vein was harvested and constructed into a spiral graft. The graft was inserted using a standard inlay technique. After 12 months the patient is in good health. No inflammation or dilation of the saphenous vein spiral graft has been noted. We suggest that in the emergency treatment of mycotic abdominal aneurysm, aortic reconstruction with saphenous vein spiral graft is a valuable option.