Short answer
A pseudoaneurysm is also known as a false aneurysm. It is a blood‑filled cavity that forms outside the vessel wall but is still confined by surrounding tissue.
Key points
- Pseudoaneurysm = false aneurysm
- Occurs when blood leaks through a vessel wall breach
- Surrounding tissue forms a sac that pulsates with each heartbeat
- Diagnosed with ultrasound showing a to‑and‑fro flow pattern
- Treatable by compression, thrombin injection, or surgery
A pseudoaneurysm is commonly called a false aneurysm because it is a blood‑filled cavity that forms outside the arterial wall yet remains confined by surrounding tissue.
How a false aneurysm forms
The vessel wall is breached, often after trauma, catheterization, or infection. Blood escapes the lumen and pools between the outer arterial layer and nearby tissue, creating a sac that expands with each heartbeat. Unlike a true aneurysm, all three arterial layers stay intact.
Diagnosis and treatment options
Ultrasound is the usual first test; it shows the characteristic “to‑and‑fro” flow at the neck of the sac. Larger or symptomatic false aneurysms may need intervention. Options include ultrasound‑guided compression, percutaneous thrombin injection, or surgical repair if the sac is at high risk of rupture.
Early detection prevents serious complications such as hemorrhage or thrombosis.
Frequently asked questions
What causes a pseudoaneurysm?
Common causes are arterial puncture during medical procedures, blunt or penetrating trauma, and infections that weaken the vessel wall.
How can a pseudoaneurysm be distinguished from a true aneurysm?
A true aneurysm involves dilation of all arterial wall layers, while a pseudoaneurysm is a contained rupture with blood held by surrounding tissue.
Is a false aneurysm dangerous?
Yes, because the sac wall is fragile and can rupture, leading to rapid bleeding if not treated.
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