: Thrombin Injection for Pseudoaneurysm (Procedure)

: What Is a Pseudoaneurysm?

: A pseudoaneurysm is a collection of blood that forms outside the wall of an artery but stays connected to it through a small opening. It is sometimes called a false aneurysm because it is not a true ballooning of the vessel wall; instead, it is contained by surrounding tissue. These often occur after a puncture to an artery, such as during a catheter procedure.

: What the Procedure Involves

: Using ultrasound guidance, the doctor locates the pseudoaneurysm and guides a thin needle through the skin into the blood-filled sac. A small amount of thrombin, a protein that promotes clotting, is injected. The thrombin causes the blood inside the sac to clot, and the clot blocks the connection to the artery. Ultrasound is used throughout to confirm the sac has been sealed.

: Why It Is Done

: Thrombin injection is typically offered when a pseudoaneurysm does not close on its own and is at risk of enlarging, rupturing, or causing symptoms such as pain or pressure on nearby structures. It is generally preferred over surgery because it is less invasive and can often be done without general anesthesia.

: What to Expect

: The procedure is usually quick and performed in an imaging or procedure room rather than an operating room. Local numbing medicine is used at the injection site. Many patients can go home the same day, though your care team will give specific instructions. Follow-up ultrasound is commonly scheduled to confirm the pseudoaneurysm has stayed closed.