What is a pseudoaneurysm?

A pseudoaneurysm is correctly described as a contained rupture of a vessel. Unlike a true aneurysm, which involves all three layers of the arterial wall, a pseudoaneurysm forms when there is a breach in the vessel wall that allows blood to escape into the surrounding tissue, but is contained by the surrounding structures—such as the adventitia or surrounding connective tissue. This results in a hematoma that communicates with the blood vessel, which can create an outpouching that resembles an aneurysm but lacks the full structural integrity of the vessel wall.

This context helps clarify the nature of a pseudoaneurysm: it may occur after trauma, surgery, or vascular interventions where the integrity of the vessel is compromised. It is essential to recognize the difference between true and pseudoaneurysms, as they have different implications for treatment and management. Understanding this distinction is critical for healthcare professionals, especially those involved in cardiovascular care and perfusion, where they might encounter complications related to blood vessels.