Safety and Effectiveness Study of Endovascular Abdominal Aortic Aneurysm Repair Using the Nellix® System

Inclusion Criteria: * Male or female at least 18 years old; * Informed consent understood and signed; * Patient agrees to all follow-up visits; * Have AAA with sac diameter ≥5.0cm, or ≥4.5 cm which has increased by \>1.0cm in the past year. * Anatomic eligibility for the Nellix System per the instructions for use: * Adequate iliac/femoral access compatible with the required delivery systems (diameter ≥6 mm); * Aneurysm blood lumen diameter ≤60mm; * Most caudal renal artery to aortoiliac bifurcation length ≥100mm; * Proximal non-aneurysmal aortic neck: length ≥10mm; lumen diameter 18 to 32mm; angle ≤60° to the aneurysm sac; * Common iliac artery lumen diameter between 9 and 35mm with blood lumen diameter ≤35mm; * Ability to preserve at least one hypogastric artery. Exclusion Criteria: * Life expectancy \<2 years; * Psychiatric or other condition that may interfere with the study; * Participating in enrollment of another clinical study * Known allergy to device any device component; * Coagulopathy or uncontrolled bleeding disorder; * Ruptured, leaking or mycotic aneurysm; * Serum creatinine level \>2.0mg/dL; * CVA or MI within three months of enrollment/treatment; * Aneurysmal disease of the descending thoracic aorta; * Clinically significant infrarenal mural thrombus (\>5mm thickness over \>50% circumference); * Connective tissue diseases (e.g., Marfan Syndrome) * Unsuitable vascular anatomy; * Pregnant (females of childbearing potential only).