Abdominal Aortic Aneurysm – ACR 2013
Recommended intervals for initial follow-up imaging of ectactic aortas and abdominal aortic aneurysms
| Aortic Diameter | Imaging Interval |
|---|---|
| 2.5 - 2.9 cm | 5 years (defined as ectactic) |
| 3.0 - 3.4 cm | 3 years |
| 3.5 - 3.9 cm | 2 years |
| 4.0- 4.4 cm | 1 year |
| 4.5 - 4.9 cm | 6 months, also consider surgical or endovascular referral |
| 5.0 - 5.5 cm | 3-6 months, also consider surgical or endovascular referral |
- “The normal diameter of the suprarenal abdominal aorta is up to 3.0 cm, and that of the infrarenal abdominal aorta is 2.0 cm.”
- “Aneurysmal dilation of the infrarenal aorta is defined as a diameter ≥3.0 cm or dilation of the aorta ≥1.5 times the normal diameter.”
- “For abdominal aortic diameters <2.5 cm, follow-up is generally thought to be unnecessary. Because the rupture of smaller abdominal aortic aneurysms is less likely, we recommend longer intervals between follow-up examinations. Follow-up intervals may vary depending on comorbidities and the growth rate of the aneurysm.”