Pilot Study of the Endologix Fenestrated Stent Graft System

Inclusion Criteria: * Informed consent understood and signed and pt agrees to all follow-up visits; * Abdominal aortic aneurysm with diameter ≥5cm or ≥4cm which has increased by 0.5cm or more in the past six months * Adequate iliac/femoral access compatible with the required delivery systems * Non-aneurysmal infrarenal aortic neck \<15mm in length * Most caudal renal artery to aortoiliac bifurcation length at least 70mm * Proximal non-aneurysmal aortic neck below the SMA with: diameter 18 to 34 mm; length at least 15 mm; angle (clock face) \<60° to the aneurysm sac; * Angle \<60° (clock face) between the SMA and celiac artery * Renal arteries both distal to the SMA by 0-35mm, within 30mm of each other axially, with 4 to 8mm lumen diameter, and with clockface angle of 90° to 210° to each other * Iliac anatomy suitable for commercial bifurcated stent graft; * Minimum 3cm overlap achievable between fenestrated and bifurcated stent grafts Exclusion Criteria: * Life expectancy \<1 year as judged by the investigator; * Psychiatric or other condition that may interfere with the study; * Participating in the enrollment or 30-day follow-up phase of another clinical study; * Known allergy to any device component; * Coagulopathy or uncontrolled bleeding disorder; * Contraindication to contrast media or anticoagulants; * Ruptured, leaking, dissecting, or mycotic aneurysm; * Serum creatinine (S-Cr) level \>2.0 mg/dL; * Traumatic vascular injury; * Active systemic or localized groin infection; * Connective tissue disease (e.g., Marfan's Syndrome); * Recent (within prior three months) cerebrovascular accident or myocardial infarction; * Prior renal transplant; * Length of either renal artery to be stented \<13mm; * Significant occlusive disease or calcification of either renal artery; * An essential accessory renal artery; * Indispensable inferior mesenteric artery; * Untreated aneurysmal disease of the descending thoracic aorta; * Clinically significant mural thrombus circumferentially in the suprarenal segment; * Prior iliac artery stent implanted that may interfere with delivery system introduction; * Unsuitable vascular anatomy * Pregnancy (female patient of childbearing potential only)