What is the gold standard imaging modality for abdominal aortic aneurysm?

What is the gold standard imaging modality for abdominal aortic aneurysm?

• A. Abdominal ultrasound
• B. CT with contrast
• C. MRI
• D. Plain X-ray

Answer: (B)

CT angiography with IV contrast is the gold standard for abdominal aortic aneurysm imaging. It provides precise, reproducible measurements of the maximum aortic diameter and a detailed view of the aneurysm’s full extent, including involvement of the visceral and iliac branches, mural thrombus, and calcifications. This high-resolution anatomic information is essential for planning treatment, whether choosing open repair or endovascular repair, and for preoperative planning. Ultrasound is excellent for initial screening and surveillance because it’s quick, safe, and inexpensive, but its accuracy is operator-dependent and it cannot reliably assess the distal extent or the relationship to branch vessels. MRI can be useful in select cases (e.g., contrast allergy or specific surveillance needs) but is less practical in acute settings due to longer scan times and availability. Plain X-ray has limited utility for aneurysm assessment.

CT angiography with IV contrast is the gold standard for abdominal aortic aneurysm imaging. It provides precise, reproducible measurements of the maximum aortic diameter and a detailed view of the aneurysm’s full extent, including involvement of the visceral and iliac branches, mural thrombus, and calcifications. This high-resolution anatomic information is essential for planning treatment, whether choosing open repair or endovascular repair, and for preoperative planning.

Ultrasound is excellent for initial screening and surveillance because it’s quick, safe, and inexpensive, but its accuracy is operator-dependent and it cannot reliably assess the distal extent or the relationship to branch vessels. MRI can be useful in select cases (e.g., contrast allergy or specific surveillance needs) but is less practical in acute settings due to longer scan times and availability. Plain X-ray has limited utility for aneurysm assessment.