Is Arteriovenous Malformation AVM hereditary?

Most cases of Arteriovenous Malformation (AVM) are considered sporadic, meaning they occur randomly and are not inherited from parents. While rare genetic syndromes can cause multiple AVMs, the vast majority of solitary Arteriovenous Malformation cases are not hereditary and do not follow a predictable inheritance pattern.

Is Arteriovenous Malformation (AVM) hereditary or genetic?

There is an important distinction between a condition being "genetic" and "hereditary." A condition is genetic if it involves an alteration in DNA, while it is hereditary if that alteration is passed from parent to child. Most Arteriovenous Malformation cases are neither hereditary nor familial. They arise from de novo (spontaneous) somatic mutations that occur after conception in the cells forming the blood vessels. Because these mutations are not present in the germline (sperm or egg), they cannot be passed on to offspring.

When is Arteriovenous Malformation (AVM) associated with genetic syndromes?

While most Arteriovenous Malformation diagnoses are isolated, certain rare, multisystem genetic disorders are associated with the development of vascular anomalies. In these instances, the risk to family members depends on the specific syndrome involved. Examples of conditions that may include AVMs as part of a broader genetic profile include:

• Hereditary Hemorrhagic Telangiectasia (HHT): An autosomal dominant disorder often linked to mutations in the ENG, ACVRL1, or MADH4 genes.


• Capillary Malformation-Arteriovenous Malformation (CM-AVM) syndrome: Typically caused by mutations in the RASA1 or EPHB4 genes, following an autosomal dominant pattern.


• PTEN Hamartoma Tumor Syndrome: Associated with various vascular malformations.

Is genetic testing recommended for AVM?

Routine genetic testing is not typically recommended for patients with a sporadic, isolated Arteriovenous Malformation. However, genetic evaluation is strongly encouraged if a patient presents with:

1. Multiple AVMs throughout the body.


2. A strong family history of vascular anomalies or unexplained strokes/hemorrhages.


3. Associated clinical features such as skin telangiectasias or other syndromic symptoms.

In our DiseaseMaps.org community of 200 members, those with syndromic forms of Arteriovenous Malformation often benefit significantly from meeting with a genetic counselor to discuss the 50% recurrence risk associated with autosomal dominant conditions.

Next steps

• Consult with a clinical geneticist if you have a family history of vascular malformations.


• Discuss the necessity of genetic testing with your neurologist or vascular surgeon.


• Connect with the 200 members on DiseaseMaps.org to share experiences and find support.


• Request a referral to a specialized vascular anomalies center for comprehensive evaluation.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice; always consult a qualified healthcare professional for diagnosis and treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Arteriovenous Malformations.


• Orphanet: Rare vascular malformations database.


• OMIM (Online Mendelian Inheritance in Man): Entry for RASA1 and Capillary Malformation-Arteriovenous Malformation.


• The Angioma Alliance: Resources on vascular malformation genetics.