What happens if a pseudoaneurysm goes untreated?

The Hidden Danger of Untreated Pseudoaneurysms

A pseudoaneurysm, sometimes called a "false aneurysm," occurs when blood leaks from an injured artery and collects nearby, contained only by surrounding tissue. Unlike a true aneurysm, the vessel wall is breached, making it unstable. While small pseudoaneurysms may occasionally resolve on their own, leaving one untreated can lead to serious, even life-threatening complications.

The most dangerous outcome is rupture. Though the likelihood is relatively low, a ruptured pseudoaneurysm can cause sudden and massive internal bleeding—rapid, uncontrolled hemorrhage that becomes a medical emergency. Once rupture occurs, stopping the bleeding is extremely difficult, even with immediate surgery. The anatomy around the affected artery can make surgical access complex, and the fragile tissue often complicates repair attempts.

Because of this risk, early detection is crucial. Many pseudoaneurysms are discovered incidentally during imaging for unrelated conditions, or they present with a pulsating mass and localized pain. Ultrasound and other imaging tools can confirm the diagnosis, allowing for timely intervention before disaster strikes.

Treatment options—ranging from ultrasound-guided compression and thrombin injections to minimally invasive procedures or surgery—depend on size, location, and patient factors. But regardless of approach, the goal remains the same: prevent rupture before it happens.

While not every pseudoaneurysm demands urgent action, dismissing one as harmless can be a dangerous gamble. When in doubt, early evaluation and appropriate management save lives.