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Arteriovenous malformations (AVMs) happen when a group of blood vessels in your body forms incorrectly. In these malformations, arteries and veins are unusually tangled and form direct connections, bypassing normal tissues.

Arteriovenous malformations, or AVMs, are irregular connections between arteries and veins. They can occur anywhere in the body but are most common in the brain and spinal cord.

Treatment for AVM depends on where it is found, the symptoms and the risk of treatment. Sometimes an AVM is monitored with regular imaging tests to watch for changes or problems. Other AVMs require treatment.

Seek immediate medical attention if you notice any signs or symptoms of a brain AVM , such as seizures, headaches or other symptoms. A bleeding brain AVM is life-threatening and requires emergency medical attention.

Leading AVM providers include CoreLogic, the Federal Home Loan Mortgage Corp. (Freddie Mac), VeroVALUE, and Equifax. The public can use them through free consumer real estate sites. Zillow's popular web-based real estate valuation tool, Zestimate, is one well-known type of AVM.

AVMs can form virtually anywhere in the brain or spinal cord—wherever arteries and veins exist. Some are formed from blood vessels located in the dura mater or in the pia mater, the outermost and innermost, respectively, of the three membranes surrounding the brain and spinal cord.

Extracranial AVMs exist outside the skull and intracranial AVMs occur inside the skull. Intracranial AVMs may affect blood flow directly to the brain and could cause stroke. AVMs also may cause congestive heart failure if large amounts of blood flow rapidly through them.

AVMs result from the development of irregular connections between arteries and veins, but experts don't understand why this happens. Certain genetic changes might play a role, but most types are not usually inherited, which means passed down in families.

AVMs can form virtually anywhere in the brain or spinal cord—wherever arteries and veins exist. Some are formed from blood vessels located in the dura mater or in the pia mater, the outermost and innermost, respectively, of the three membranes surrounding the brain and spinal cord.

Eventually, the consistently high-pressure blood flow through the AVM can cause the vessels to expand, potentially causing an aneurysm, a weakened ballooning of the vessel that can rupture and hemorrhage (bleed) into the surrounding brain tissue. This is a form of stroke.

Arteriovenous malformations, or AVMs, are irregular connections between arteries and veins. They can occur anywhere in the body but are most common in the brain and spinal cord. The greatest risk of an AVM is that it will rupture and cause a stroke.

Arteriovenous malformations (AVMs) happen when a group of blood vessels in your body forms incorrectly. In these malformations, arteries and veins are unusually tangled and form direct connections, bypassing normal tissues.

Arteriovenous malformations, or AVMs, are irregular connections between arteries and veins. They can occur anywhere in the body but are most common in the brain and spinal cord.

Treatment for AVM depends on where it is found, the symptoms and the risk of treatment. Sometimes an AVM is monitored with regular imaging tests to watch for changes or problems. Other AVMs require treatment.

Seek immediate medical attention if you notice any signs or symptoms of a brain AVM , such as seizures, headaches or other symptoms. A bleeding brain AVM is life-threatening and requires emergency medical attention.

Leading AVM providers include CoreLogic, the Federal Home Loan Mortgage Corp. (Freddie Mac), VeroVALUE, and Equifax. The public can use them through free consumer real estate sites. Zillow's popular web-based real estate valuation tool, Zestimate, is one well-known type of AVM.

AVMs can form virtually anywhere in the brain or spinal cord—wherever arteries and veins exist. Some are formed from blood vessels located in the dura mater or in the pia mater, the outermost and innermost, respectively, of the three membranes surrounding the brain and spinal cord.

Extracranial AVMs exist outside the skull and intracranial AVMs occur inside the skull. Intracranial AVMs may affect blood flow directly to the brain and could cause stroke. AVMs also may cause congestive heart failure if large amounts of blood flow rapidly through them.

AVMs result from the development of irregular connections between arteries and veins, but experts don't understand why this happens. Certain genetic changes might play a role, but most types are not usually inherited, which means passed down in families.

AVMs can form virtually anywhere in the brain or spinal cord—wherever arteries and veins exist. Some are formed from blood vessels located in the dura mater or in the pia mater, the outermost and innermost, respectively, of the three membranes surrounding the brain and spinal cord.

Eventually, the consistently high-pressure blood flow through the AVM can cause the vessels to expand, potentially causing an aneurysm, a weakened ballooning of the vessel that can rupture and hemorrhage (bleed) into the surrounding brain tissue. This is a form of stroke.

Arteriovenous malformations, or AVMs, are irregular connections between arteries and veins. They can occur anywhere in the body but are most common in the brain and spinal cord. The greatest risk of an AVM is that it will rupture and cause a stroke.