Short answer · Medically reviewed summary · Last updated: 2026-05-08
An Arteriovenous Malformation (AVM) is a rare, abnormal tangle of blood vessels where arteries and veins connect directly without the intervening capillary network, disrupting normal blood flow and oxygen delivery. These lesions can occur anywhere in the body, but they are most clinically significant when they develop in the brain or spinal cord. What causes an Arteriovenous Malformation AVM? An Arteriovenous Malformation AVM typically results from a developmental error during fetal circulation, though the exact cause of this vessel misconnection remains largely unknown.
2 people with Arteriovenous Malformation AVM have shared their first-person experience on this question at DiseaseMaps.
What is Arteriovenous Malformation AVM
What is Arteriovenous Malformation AVM? Plain-language, medically reviewed definition plus the lived reality told by patients.
An Arteriovenous Malformation (AVM) is a rare, abnormal tangle of blood vessels where arteries and veins connect directly without the intervening capillary network, disrupting normal blood flow and oxygen delivery. These lesions can occur anywhere in the body, but they are most clinically significant when they develop in the brain or spinal cord.
What causes an Arteriovenous Malformation AVM?
An Arteriovenous Malformation AVM typically results from a developmental error during fetal circulation, though the exact cause of this vessel misconnection remains largely unknown. In a healthy circulatory system, arteries carry oxygenated blood to capillaries, which then deliver nutrients to tissues before returning blood to the heart through veins. In an Arteriovenous Malformation AVM, the high-pressure arterial blood flows directly into the low-pressure veins. This bypass, known as a "nidus," lacks the resistance provided by a capillary bed, which can cause the surrounding vessels to weaken, dilate, and potentially hemorrhage.
How is an Arteriovenous Malformation AVM classified?
While an Arteriovenous Malformation AVM can form in various locations, medical professionals often categorize them based on their size, location, and the specific vessels involved. The Spetzler-Martin grading scale is commonly used to classify brain-based AVMs, helping surgeons assess the risk of intervention. Key clinical characteristics include:
- Intracranial AVMs: Located within the brain, posing risks of seizures or stroke.
- Spinal AVMs: Located in the spinal cord, which may lead to progressive weakness or paralysis.
- Peripheral AVMs: Located in the limbs or organs, potentially causing pain, swelling, or skin changes.
How common is this condition?
Data regarding the prevalence of an Arteriovenous Malformation AVM varies, but it is estimated to affect approximately 1 in 2,000 to 1 in 5,000 individuals. While these malformations are present at birth, they are often asymptomatic until early adulthood, typically between the ages of 20 and 40. At DiseaseMaps.org, over 200 people with an Arteriovenous Malformation AVM have joined our community to share their experiences and navigate the complexities of living with this condition.
Next steps
- Consult a neurosurgeon or a vascular specialist to discuss your specific imaging results.
- Join the DiseaseMaps.org community to connect with others who have been diagnosed with an Arteriovenous Malformation AVM.
- Maintain a record of your neurological symptoms to share with your care team during follow-up appointments.
Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding a medical condition.
References
- National Institute of Neurological Disorders and Stroke (NINDS) – Arteriovenous Malformations Fact Sheet.
- NIH Genetic and Rare Diseases Information Center (GARD) – AVM overview.
- Orphanet – Rare disease database information on vascular malformations.
- The Aneurysm and AVM Foundation (TAAF).
Posted Jul 5, 2020 by Mary 2500
Woyld add that the nerve bain that emanates from the brain can goto ecmvery nerve in the body. Migraine aura is asdociated with seeing flashing lights, crocodile shaped teeth in black and white. AVM headaches are accompanied by similar sensations but in colour. But best advice is to drink a pint of water at the start of ANY type of headache migraine, or tension.
Posted Nov 3, 2022 by Heather 5020
