Surveillance during the first year after EVAR should consist of contrast enhanced CT imaging at one and 12 months (Grade 1, Level A).

If a Type II endoleak or other abnormality of concern is observed on contrast enhanced CT imaging at one-month after EVAR, postoperative imaging at six months is recommended (Grade 1, Level A).

If neither endoleak nor AAA enlargement is documented during first year after EVAR, Color Duplex ultrasonography is suggested as an alternative to CT imaging for annual postoperative surveillance (Grade 2, Level C).

The presence of a Type II endoleak should initially prompt continued CT surveillance to ascertain whether the aneurysm is increasing in size. If the aneurysm is shrinking or stable in size, follow-up with CDU is suggested as an alternative to continued CT imaging (Grade 2, Level C).

A new endoleak that is detected after prior imaging studies have suggested complete aneurysm sac exclusion should prompt evaluation for a Type I or Type III endoleak (Grade 1, Level A).

Color Duplex ultrasonography and a non-contrast CT scan are recommended as a substitute for contrast enhanced CT imaging for post-EVAR surveillance of patients with renal insufficiency (Grade 1, Level A).

Non-contrast CT imaging of the entire aorta is recommended at five-year intervals after OSR or EVAR (Grade 1, Level A).