We herein report a rare case of a lethal sequela of infected pseudoaneurysm after endovascular treatment of bilateral common iliac artery. A 68-year-old female who had undergone endovascular stenting for stenotic lesions of bilateral iliac artery 4 months ago was referred to our division because of infected left common iliac pseudoaneurysm. The patient presented with left back pain and fever elevation. The blood cultures were positive for Staphylococcus caprae. The computed tomographic

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... demonstrated infected pseudoaneurysm at left common iliac artery. Emergent extra anatomical bypass grafting, resection of infected pseudoaneurysm and augmentation of greater omentum were successfully carried out simultaneously. Her postoperative course was uneventful.