What is the screening timing indicated for AAA with diameter 4.0-4.9 cm?

• A. 3 months
• B. 24 months
• C. 6 months
• D. 6-12 months

Answer: (D)

Surveillance intervals for an abdominal aortic aneurysm depend on the size. For an aneurysm measuring 4.0–4.9 cm, the recommended imaging interval is ultrasound every 6 to 12 months. This size carries a higher risk of growth and potential rupture than smaller aneurysms, but it’s not large enough to warrant immediate repair, which is usually considered around 5.5 cm or with rapid growth. Regular imaging allows detection of progression that would change management. Shorter intervals are used if growth is rapid or the diameter approaches repair thresholds, while longer intervals would risk missing significant progression.