Screening for an abdominal aortic aneurysm, monitoring its growth and evaluation of its risk of rupture are based on the measure of its maximum diameter. The abdominal aortic aneurysm's treatment to prevent its rupture is recommended from a threshold of 50-55 mm in men and of 45-50 mm in women.

The importance of this measure for patient management justify a specific and homogeneous protocol of measure. However, the diversity of methods of measuring the maximum diameter with scanner and ultrasound was shown.

The impact of various angio-CT based measures of maximum AAA diameter, and the impact of reproducibility limits on the decision to operate have never been investigated.

The aims of the study were :

Analyze the consequences on clinical decisions of this wide choice of methodologies for measurement of abdominal aortic aneurysm maximum diameter when using angio-CT; Identify the method of measurement that yields the best agreement for patient management.

Inclusion Criteria:

• patients with abdominal aortic aneurysm

Exclusion Criteria:

• inflammatory aneurysm
• false aneurysm
• aneurysm after open repair or stent graft

All patients with non-opered abdominal aortic aneurysm with angio-CT realized between 01/01 2010 au 04/15/2012