How do I know if I have a pseudoaneurysm?

Recognizing the Signs of a Pseudoaneurysm

Not all aneurysms are the same—and a pseudoaneurysm, sometimes called a “false aneurysm,” is a rare but serious condition that can develop after trauma or a medical procedure involving an artery, such as a catheterization. Unlike a true aneurysm, where the vessel wall balloons, a pseudoaneurysm occurs when blood leaks out of the artery into the surrounding tissue but remains contained by a clot or the surrounding tissue, forming a pulsating pocket.

So how do you know if you might have one? The most common signs include a painful, tender, and pulsating mass under the skin, often near a site where you’ve had a recent procedure—commonly in the groin. The area may also feel warm to the touch, and the overlying skin can appear red or discolored. Because these symptoms can mimic other conditions like abscesses or hematomas, it’s easy to misdiagnose without proper imaging.

Many people don’t realize the connection between a recent invasive procedure and the development of a pseudoaneurysm. For example, after a cardiac catheterization, a small but growing lump in the thigh that pulses with your heartbeat should never be ignored. Other symptoms might include swelling, bruising, or a feeling of fullness in the area.

If left untreated, a pseudoaneurysm can lead to complications like infection, nerve compression, or even rupture. Diagnosis typically involves an ultrasound or CT scan to confirm the presence of abnormal blood flow outside the artery.

While rare, early detection is key. If you’ve had a recent procedure involving an artery and notice a painful, pulsing lump, don’t assume it’s just a bruise. Seek medical evaluation promptly. Timely treatment—often minimally invasive—can prevent more serious outcomes.