Dural Arteriovenous Fistulas: A Rare Vascular Connection in the Brain or Spine

Dural Arteriovenous Fistulas: A Rare Vascular Connection in the Brain or Spine

A dural arteriovenous fistula (DAVF) is an abnormal vascular connection between arteries and veins embedded within the dura mater—the tough outer membrane covering the brain and spinal cord. While rare, DAVFs require expert neurovascular evaluation because elevated venous pressure can lead to severe neurological complications if left unmanaged.

How a DAVF Develops

Under normal conditions, oxygen-rich blood travels from high-pressure arteries through small capillaries before entering low-pressure veins. In a DAVF, an abnormal passage forms that allows arterial blood to bypass the capillary network and flow directly into the venous system.

This direct high-pressure flow causes elevated pressure inside surrounding cerebral or spinal veins (venous hypertension), leading to tissue swelling, hemorrhage risk, or neurological impairment.

Symptoms of Cranial and Spinal DAVFs

Symptoms vary depending on whether the fistula is located in the head or along the spine:

Cranial DAVFs (Brain)

• Pulsatile Tinnitus: Hearing a rhythmic thumping or whooshing noise in one or both ears, synchronized with your heartbeat.
• Visual Changes: Eye redness, swelling, double vision, or visual loss due to pressure behind the eye sockets.
• Persistent Headaches & Seizures: Resulting from increased intracranial pressure or localized venous congestion.

Spinal DAVFs (Spine)

• Progressive Leg Weakness: Unsteady gait or difficulty climbing stairs.
• Numbness and Tingling: Loss of sensation that gradually moves up the legs.
• Bowel and Bladder Dysfunction: Changes in control resulting from spinal cord congestion (myelopathy).

Advanced Diagnostic and Treatment Options

Accurate diagnosis requires specialized imaging, culminating in cerebral or spinal angiography, the gold-standard diagnostic tool for mapping blood flow through complex vascular malformations.

Treatment focuses on eliminating the abnormal connection to normalize venous pressure:

• Neuroendovascular Embolization: A minimally invasive procedure where an interventional specialist navigates a microcatheter through blood vessels to inject liquid embolic agents (such as Onyx or liquid glue) to seal off the fistula.
• Microsurgical Ligation: When endovascular access is restricted, micro-neurosurgery can directly expose and disconnect the abnormal arterial connections, relieving pressure on the central nervous system.

• Book Online: Visit igeaneuro.com to request a comprehensive diagnostic consultation with our neurosurgical team.
• Call Our Team Today: Speak directly with our dedicated patient care coordinators at (866) 467-1770.