Can a pseudoaneurysm cause a stroke?

Can a Pseudoaneurysm Lead to a Stroke?

While not common, a pseudoaneurysm—particularly in the vertebral artery—can indeed trigger a stroke. Unlike a true aneurysm, a pseudoaneurysm forms when there’s a tear in the artery wall, allowing blood to leak and collect nearby, creating a fragile, bulging sac. When this occurs in the vertebral artery, which supplies blood to the brainstem and cerebellum, it can disrupt blood flow to the posterior circulation of the brain.

This disruption increases the risk of ischemic stroke, especially if a clot forms at the site and breaks off, traveling to the brain. Symptoms may include sudden dizziness, imbalance, difficulty speaking, or even loss of consciousness—often mistaken for other neurological conditions. Because of its rarity and subtle presentation, vertebral artery pseudoaneurysms can be challenging to diagnose without advanced imaging like CT angiography or MRI.

When identified, treatment options are effective and typically fall into two categories: microscopic surgery or endovascular therapy. Microscopic surgery involves direct repair or clipping of the affected vessel, while endovascular therapy uses minimally invasive techniques—such as stent placement or coil embolization—to seal off the pseudoaneurysm and restore normal blood flow. The choice depends on the patient’s anatomy, the aneurysm’s size and location, and overall health.

Though rare, this condition reminds us that not all strokes stem from hypertension or atrial fibrillation. Unusual vascular abnormalities like pseudoaneurysms, especially in younger patients with no traditional risk factors, should be considered. With timely intervention, outcomes can be favorable, underscoring the importance of specialized care in stroke medicine.