Can you see pseudoaneurysm on a CT scan?

Can You See a Pseudoaneurysm on a CT Scan?

Yes, a pseudoaneurysm can be clearly visualized on a CT scan—especially when using CT angiography. Unlike a true aneurysm, a pseudoaneurysm involves a rupture in the arterial wall, where blood leaks into the surrounding tissue and becomes contained by a clot or nearby structures, forming what’s often called a “false lumen.”

CT angiography is the gold standard for detecting and evaluating these vascular abnormalities. It provides detailed, high-resolution images of blood vessels, allowing radiologists to pinpoint the size, location, and extent of the pseudoaneurysm. More importantly, it helps identify potential complications such as rupture, compression of adjacent organs, or the risk of distal embolization—information crucial for treatment planning.

In some cases, particularly with superficial arteries in the limbs, doctors may first turn to Doppler ultrasound. It’s a quick, non-invasive tool that’s effective for initial assessment of accessible pseudoaneurysms, like those in the femoral artery after catheterization. However, ultrasound has limitations—especially when the lesion is deep, obscured by bone or gas, or in critically ill patients.

That’s where CT angiography shines. It offers a comprehensive view of both central and peripheral vascular systems, making it ideal for trauma patients or those with complex presentations. With rapid scan times and wide availability in emergency settings, it’s often the go-to imaging method when time and accuracy are critical.

While pseudoaneurysms can result from trauma, surgery, or infection, catching them early with the right imaging can prevent life-threatening outcomes. Whether starting with ultrasound or going straight to CT, timely diagnosis remains key—and modern imaging makes it possible.