The strength of movement which are applied on the EVAR are not only cranio-caudal but also lateral. The movement of the EVAR's body within the aneurysm could be an instability's criteria of the EVAR. The investigators would like to show that this lateral movement is a risk factor of reintervention they should follow and suggest a reinforced medical follow-up to avoid complications.

Inclusion Criteria:

• Male or female > 18 years old
• All patients treated in the vascular surgery department of Besançon for an abdominal aortic aneurysm with an endoprothesis (symptomatic or asymptomatic)

Exclusion Criteria:

• Patient in emergency situation (ruptured abdominal aortic aneurysm)
• Life expectancy supposed to be inferior to 1 year
• Legal incapacity or limited capacity
• Pregnant female
• Patient unlikely to cooperate with the study
• Patient without health insurance

All patients treated in the vascular surgery department of Besançon for an abdominal aortic aneurysm with an endoprothesis (symptomatic or asymptomatic)