The purpose of the Zenith® p-Branch® OTS Multicenter Study is to provide an early clinical experience and evaluate the safety and effectiveness of the Zenith® p-Branch® in the treatment of pararenal or juxtarenal abdominal aortic aneurysms (AAA).

Inclusion Criteria:

• Pararenal or juxtarenal AAA ≥5.0 cm in diameter or 2 times the normal aortic diameter
• Pararenal or juxtarenal AAA with history of growth ≥0.5 cm/year
• Saccular aneurysm with aortic diameter greater than 1.5 times the normal aortic diameter that is deemed to be at risk for rupture based upon physician interpretation

Exclusion Criteria:

• Age <18 years
• Life expectancy <2 years
• Pregnant, breast-feeding, or planning on becoming pregnant within 60 months
• Inability or refusal to give informed consent by the patient or a legally authorized representative
• Unwilling or unable to comply with the follow-up schedule
• Simultaneously participating in another investigative device or drug study. (The patient must have completed the primary endpoint of any previous study at least 30 days prior to enrollment in this study.)
• Additional medical restrictions as specified in the Clinical Investigation Plan
• Additional anatomical restrictions as specified in the Clinical Investigation Plan