Cordis Bilateral AAA Device Compared to Open Surgical Repair of Abdominal Aortic Aneurysms (ARIBA)

Inclusion Criteria: \- Anatomic (stent-graft) Aortic Aneurysm Diameter * \> 4.5 cm * Those aortic aneurysms \< 4.5 cm that are at least 1.5 times the diameter of the aorta with a size increase of 5 mm or greater over a six month period will also be included for possible treatment. * Aorto-iliac aneurysms in which the aortic aneurysm is \< 4.5 cm but the iliac artery aneurysms are \> 3.0 cm in diameter or there is evidence of recent expansion (5 mm or greater over a six month period) in iliac aneurysms \< 3.0 cm. * Saccular aortic aneurysms \> 3.0 cm. Aortic Neck * Diameter \> 17 mm and \< 28 mm (Phase I) * Diameter \> 14 mm and \< 28 mm (Phase II) Angulation Neck Length \< 45° \> 15 mm \<60° \> 25 mm Iliac Arteries * Diameter \> 8 mm and \< 18 mm (Phase I and Phase II) * At least one common iliac artery with a cuff \> 15 mm. Diameter Aortic Neck Common Iliac 26-28 mm 13-18 mm 23-25.9 mm 10-17 mm 20-22.9 mm 9-15 mm 17-19.9 mm 8-13 mm 14-16.9 mm 8-11mm \*NOTE: An aortic diameter cannot be treated if the iliac diameter is not in the same range (e.g. 26-28 mm aortic necks must be in conjunction with 13-18 mm common iliacs). Anatomic (surgical controls) · Surgical controls will be required to meet only the aortic or aorto-iliac aneurysm size requirements for anatomic inclusion criteria. Aortic Aneurysm Diameter * \> 4.5 cm * Those aortic aneurysms \<4.5 cm that are at least 1.5 times the diameter of the aorta with a size increase of 5 mm or greater over a six month period will also be included for possible treatment. * Aorto-iliac aneurysm in which the aortic aneurysm is \<4.5 cm but the iliac artery aneurysm are \>3.0 cm in diameter or there is evidence of recent expansion (5 mm or greater over a six month period) in iliac aneurysms \<3.0 cm. * Saccular aortic aneurysms \> 3.0 cm. * Clinical (stent-graft) * Males and non-pregnant females \> 40 years of age. * Clinical (surgical controls) Surgical control patients will be required to meet all of the above-stated stent-graft clinical inclusion criteria. Exclusion Criteria: Anatomic (stent-graft) Aortic Aneurysm Diameter · \< 4.5 cm that are not at least 1.5 times the diameter of the aorta with evidence of a size increase of 5 mm or greater within a six month period. Aorto-iliac Aneurysms * \< 3.0 cm in diameter unless evidence of recent expansion (5 mm or greater within a six month period). * The iliac portion of the aneurysm extending to the bifurcation bilaterally which would necessitate covering both internal iliac arteries with the device. Aortic Neck * Diameter \< 17 mm and \> 28 mm (Phase I) * Diameter \< 14 and \>28 (Phase II) * Thrombus lined * Highly calcified * NOTE: See inclusion criteria for length below the renals and degree of angulation. Iliac Arteries * \< 8 mm and \> 18 mm (native) (Phase I and Phase II) * Highly calcified (common) * Neither common iliac artery with a cuff \> 15 mm. * NOTE: See inclusion criteria for aortic neck and iliac artery diameters. Anatomic (surgical controls) · Surgical controls will be excluded based only on the aortic or aorto-iliac aneurysm size requirements for anatomic exclusion criteria. Aortic Aneurysm Diameter · \< 4.5 cm that are not at least 1.5 times the diameter of the aorta with evidence of a size increase of 5 mm or greater within a six month period. Aorto-Iliac Aneurysms * \< 3.0 cm in diameter unless evidence of recent expansion (5 mm or greater within a six month period). * The iliac portion of the aneurysm extending to the bifurcation bilaterally which would necessitate surgically covering both internal iliac arteries. Clinical (stent-graft) 1. Ruptured abdominal aortic aneurysm. 2. Renal insufficiency - creatinine level \> 2.5 mg/dl.