**2. Preoperative evaluation**

A contrast enhanced computed tomography of the chest and the abdomen was performed to evaluate systemic atherosclerotic disease. A coronary angiography was performed routinely to evaluate the coronary artery disease in elective cases and also magnetic resonance angiog‐ raphy of carotid, vertebral and intracranial arteries to evaluate potential cerebral ischemia.

© 2013 Suzuki and Asai; licensee InTech. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. © 2013 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

#### **3. Indication for open surgery**

Our threshold diameter for the treatment of aneurysm was 5 cm, however, the presence of risk factors influenced the individual indication for surgery such as age, pain symptom, chronic obstructive pulmonary disease, renal insufficiency and the expansion rate of the aneurysm. A saccular type aneurysm was indicated for surgery regardless of the size.
