16755 Arteriovenous Malformation Avm

Overview

An arteriovenous malformation (AVM) is an abnormal tangle of blood vessels where arteries connect directly to veins without the normal network of tiny vessels in between. This can disrupt blood flow and may sometimes cause bleeding or other problems. AVMs most often occur in the brain or spine, but they can also appear elsewhere in the body.

No, AVMs are rare. They are found in less than 1 out of every 100 people, and only about 1 in every 100,000 people is newly diagnosed each year.

An AVM can occur at any age, but symptoms most often appear between the ages of 20 and 40. It affects both males and females roughly equally.

Symptoms

Common symptoms

• No symptoms at all (many AVMs are found accidentally)
• Headaches, sometimes resembling migraines
• Seizures
• Weakness or numbness in the face, arm, or leg
• Dizziness or problems with balance
• Vision problems or double vision
• A ringing or whooshing sound in the ear (pulsatile tinnitus)

Symptoms in children

• Delays in developmental milestones such as speech, movement, or learning
• Headaches or vomiting
• Seizures
• Difficulty with coordination or walking
• Unexplained irritability or behavior changes

Symptoms in older adults

• New or worsening headaches
• Confusion or memory changes
• Balance problems or falls
• Sudden weakness or numbness
• Seizures in someone who has never had them before

Causes

Main causes

• The exact cause of most AVMs is unknown.
• Most AVMs develop before birth when the blood vessels in the brain or spine do not form normally.
• In rare cases, an AVM may be linked to an inherited condition, such as hereditary hemorrhagic telangiectasia (HHT).

Risk factors

• Having a family history of AVMs or certain genetic conditions such as HHT
• Being between the ages of 20 and 40 (when symptoms often become noticeable)
• Having high blood pressure, which can increase the risk of bleeding if an AVM is present

When to see a doctor

See a doctor urgently if:

• If you have a sudden, severe headache, weakness, speech problems, or a seizure, call your local emergency number immediately.
• If you have a new seizure or repeated seizures, seek urgent medical care the same day.

Book a routine appointment if:

• If you have recurrent headaches, dizziness, or unexplained neurological symptoms that come and go, make a routine appointment with your doctor.
• If you have a family history of AVMs or related genetic conditions, discuss this with your healthcare provider.

Diagnosis

A healthcare provider will take your medical history, ask about your symptoms, and perform a physical examination. If an AVM is suspected, they will arrange imaging tests to look at the blood vessels in the affected area.

Tests that may be done

• Magnetic resonance imaging (MRI): uses magnetic fields to create detailed images of the brain and spinal cord.
• Computerized tomography (CT) scan: uses X-rays to create cross-sectional images and can show bleeding if present.
• CT angiography (CTA) or magnetic resonance angiography (MRA): special imaging that highlights the blood vessels.
• Cerebral angiography (angiogram): a thin tube is inserted into an artery and dye is injected to see the AVM in detail. This is the most precise test.

What to expect at your appointment

You may be referred to a specialist, such as a neurologist or a neurosurgeon. The imaging tests are painless, but some require a dye to be injected through a small tube, so tell your healthcare team about any allergies or kidney problems. The process can feel overwhelming, so it is fine to ask questions and take a trusted friend or family member with you.

Treatment

Treatment for an AVM depends on its size, location, whether it is causing symptoms, and the risk of bleeding. Some AVMs require no treatment and are simply monitored over time. If treatment is recommended, there are several options, often depending on the individual case.

Self-care at home

• Do not smoke, as smoking can damage blood vessels and raise blood pressure.
• Keep your blood pressure in a healthy range by reducing salt, staying active, and managing stress.
• Avoid heavy lifting or intense straining if your doctor advises it, because these can temporarily raise pressure in the brain.
• Limit alcohol, and avoid recreational or stimulant drugs.
• Track your symptoms and report any changes to your healthcare team.

Medical treatments

Medicines may be used to manage symptoms such as seizures, headaches, or neurological problems, but there is no specific drug that cures an AVM. Endovascular embolization uses a thin tube to place a glue-like material into the abnormal vessels to block blood flow. Stereotactic radiosurgery uses guided radiation beams to shrink the AVM over time. Neurosurgery may remove the AVM if it is accessible and the risk is considered acceptable.

When is surgery considered?

Surgery may be recommended if the AVM is located in an area of the brain or spine that can be safely accessed, particularly if it has already bled or has a high risk of bleeding. Your specialist will explain the risks and benefits so you can make an informed choice.

Living with this condition

If you are living with an AVM, keep up with regular follow-up appointments as advised by your healthcare team. Keep a symptom diary and contact your doctor if you notice anything new or unusual. It can help to bring a family member to appointments to help remember what is discussed.

Lifestyle tips

• Stay physically active with gentle, regular exercise like walking, unless your doctor says otherwise.
• Get enough sleep and manage stress through relaxation techniques, reading, or spending time with loved ones.
• Avoid smoking and keep alcohol intake low.
• Protect your head with seatbelts and appropriate safety gear during sports or activities with a risk of falls or injury.

Diet and exercise

Eat a balanced diet rich in fruits, vegetables, whole grains, and lean proteins, and keep salt intake moderate to help maintain stable blood pressure. Gentle aerobic exercise such as walking, swimming, or cycling is usually safe, but discuss heavy lifting, high-intensity interval training, or contact sports with your doctor first.

Mental health and emotional wellbeing

Living with an AVM can be stressful and may cause anxiety, fear, or low mood. It is normal to feel this way. Consider speaking with a counsellor or psychologist, and do not hesitate to ask your healthcare team for guidance. You are not alone in this.

Prevention

No, an AVM cannot be prevented because it usually develops before birth. However, you can reduce the risk of complications by avoiding smoking, keeping your blood pressure healthy, and following your doctor's advice about monitoring or treatment.

Vaccines

There is no specific vaccine for AVMs, but keeping up to date with all routine vaccinations is important for your overall health.

Screening programmes

If you have a family history of AVMs or a genetic condition that increases your risk, your doctor might suggest screening tests. For people without such risk factors, routine screening is not recommended for the general public.

Complications

If left untreated

• The main concern is bleeding (hemorrhage) from the AVM, which can cause stroke or permanent brain damage.
• Seizures that may become frequent or difficult to control.
• Progressive neurological deficits such as weakness, numbness, or trouble with speech and coordination.
• A condition called hydrocephalus or increased pressure in the brain if bleeding blocks the normal flow of fluid.

Long-term outlook

The outlook for people with an AVM is generally good, especially for those who do not have symptoms or who are diagnosed before any serious bleeding occurs. With modern treatment and careful monitoring, many AVMs can be managed successfully, and a large number of people go on to live full, active lives. Your specialist will be able to give you a more accurate outlook based on your specific situation.

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