How would you diagnose an abdominal aortic aneurysm (AAA)?

How would you diagnose an abdominal aortic aneurysm (AAA)?

• A. Abdominal ultrasound
• B. CT A/P with IV contrast
• C. MR angiography
• D. Plain X-ray

Answer: (B)

The main idea is to use imaging that both confirms the presence of an abdominal aortic aneurysm and provides detailed anatomy to guide treatment. Abdominal ultrasound is excellent for quick screening because it’s noninvasive and fast, but CT angiography with IV contrast is the best choice for a definitive diagnosis and for planning repair. It gives precise measurements of the aneurysm diameter, defines its extent and relation to the renal and visceral arteries, and detects thrombus, calcifications, and signs of rupture or impending rupture. The information from CT angiography, including 3D reconstructions, is crucial for deciding between open versus endovascular approaches and for planning any necessary procedures. MR angiography could be used when contrast is contraindicated or radiation must be avoided, but it’s slower and less practical in many settings. Plain X-ray cannot reliably visualize the aneurysm or its detailed anatomy.

The main idea is to use imaging that both confirms the presence of an abdominal aortic aneurysm and provides detailed anatomy to guide treatment. Abdominal ultrasound is excellent for quick screening because it’s noninvasive and fast, but CT angiography with IV contrast is the best choice for a definitive diagnosis and for planning repair. It gives precise measurements of the aneurysm diameter, defines its extent and relation to the renal and visceral arteries, and detects thrombus, calcifications, and signs of rupture or impending rupture. The information from CT angiography, including 3D reconstructions, is crucial for deciding between open versus endovascular approaches and for planning any necessary procedures. MR angiography could be used when contrast is contraindicated or radiation must be avoided, but it’s slower and less practical in many settings. Plain X-ray cannot reliably visualize the aneurysm or its detailed anatomy.