Arteriovenous Malformations
An arteriovenous malformation (AVM) is an abnormal connection between arteries and veins that can occur in the brain, spinal cord, or other areas of the body. Normally, blood flows from arteries through smaller blood vessels called capillaries before reaching veins. In an AVM, blood vessels are connected in an unusual way, which can affect normal blood flow.
Brain and spinal AVMs are uncommon vascular conditions that are often present from birth, although the exact cause is not always known. Some AVMs may not cause symptoms, while others may affect surrounding tissues or result in complications depending on their size, location, and characteristics.
Common Symptoms
Symptoms of an AVM can vary depending on its location and whether it affects surrounding tissues.
Possible symptoms may include:
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Headaches
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Seizures
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Numbness, weakness, or changes in sensation
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Vision changes
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Difficulty with speech, movement, or coordination
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Dizziness or balance problems
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Confusion or changes in neurological function
In some cases, an AVM may not cause noticeable symptoms and may be discovered during imaging performed for another reason.
Risk Factors and Causes
The exact cause of arteriovenous malformations is not fully understood. Many AVMs are believed to develop during fetal development and are present from birth.
Factors associated with AVMs may include:
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Congenital development: Many AVMs are thought to result from abnormal blood vessel development before birth.
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Family history: Some rare genetic conditions can increase the likelihood of developing vascular abnormalities.
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Associated vascular conditions: Certain inherited conditions may be linked with multiple AVMs or other blood vessel abnormalities.
Most brain and spinal AVMs are not caused by lifestyle factors, and many occur without a known family history or identifiable cause.
How Can Arteriovenous Malformations Be Treated?
Treatment for an arteriovenous malformation depends on factors such as the location, size, blood vessel structure, symptoms, and individual patient circumstances.
A specialist can evaluate imaging findings and discuss available treatment approaches based on the specific characteristics of the AVM.