AAA ultrasound result explanation

Overview

An abdominal aortic aneurysm (AAA) is a bulge or balloon-like swelling in the main blood vessel (the aorta) that runs through your abdomen. An ultrasound scan can see if your aorta is a normal size or if there is an aneurysm. A normal result means no aneurysm. A small aneurysm means the aorta is slightly widened and will be checked regularly. A large aneurysm means the aorta is significantly widened and may need treatment to prevent a dangerous rupture.

AAA is not very common, but it becomes more likely as you get older. About 1 in 25 people over the age of 65 have an AAA.

AAA mainly affects men over 65, but women can also get it. People who smoke, have high blood pressure, or have a family history of AAA are at higher risk.

Symptoms

Common symptoms

• Most people with an AAA have no symptoms. That is why screening is important.

Symptoms in children

• AAA is very rare in children. When it does occur, it is usually due to a genetic condition and may cause a pulsing feeling in the belly or back pain.

Symptoms in older adults

• Older adults with AAA often have no symptoms. If symptoms do appear, they may include a deep ache in the back or side, a pulsing sensation in the abdomen, or a feeling of fullness after eating.

Causes

Main causes

• The exact cause is not always clear, but AAA often results from atherosclerosis (hardening of the arteries), which weakens the artery wall over time.

Risk factors

• Being male and over 65
• Smoking or a history of smoking
• High blood pressure
• High cholesterol
• A family history of AAA
• Certain genetic conditions (such as Marfan syndrome or Ehlers-Danlos syndrome)

When to see a doctor

See a doctor urgently if:

• If you have sudden, severe pain in your back or belly, call your local emergency number immediately (such as 999 in the UK or 911 in the US).

Book a routine appointment if:

• If you are a man over 65, ask your doctor about AAA screening.
• If you have risk factors (like smoking or family history) and are over 50, talk to your doctor about whether screening is right for you.

Diagnosis

AAA is usually found during a routine screening ultrasound or when an ultrasound is done for another reason. The ultrasound uses sound waves to create a picture of your aorta and measure its width. Your doctor will explain the result: normal (no aneurysm), small aneurysm, or large aneurysm.

Tests that may be done

• Abdominal ultrasound (the main test)
• Sometimes a CT scan or MRI for more detail if treatment is being considered

What to expect at your appointment

The ultrasound is painless and takes about 10–15 minutes. You lie on a table, a cool gel is applied to your belly, and a small device (transducer) is moved across your skin. The sonographer looks at the image to measure your aorta. Your doctor will review the results and discuss them with you, usually within a few days.

Treatment

Treatment depends on the size of the AAA and how fast it is growing. Small aneurysms are usually monitored with regular ultrasounds. Larger or fast-growing aneurysms may need a procedure to prevent rupture.

Self-care at home

• Quit smoking if you smoke – this is the most important step.
• Manage high blood pressure by eating a low-salt diet and taking prescribed medicines.
• Control cholesterol with a heart-healthy diet and any medicines your doctor recommends.
• Stay physically active as advised by your doctor.
• Avoid heavy lifting or straining.

Medical treatments

Your doctor may prescribe medicines to lower blood pressure and cholesterol. These help slow the growth of the aneurysm. No medicine can shrink an existing aneurysm. If the aneurysm becomes large, your doctor may recommend a procedure – such as endovascular stent grafting (a less invasive approach) or open surgery – to repair the weakened artery.

When is surgery considered?

Surgery is usually recommended when the aneurysm is large (over 5.5 cm in men or 5.0 cm in women) or growing quickly (more than 1 cm per year). Your doctor will talk with you about the best option based on your age, overall health, and the size and shape of the aneurysm.

Living with this condition

If you have a small AAA, you can live a normal life. You will need regular ultrasound appointments to check the size. It is important to know the warning signs of rupture and to call emergency services immediately if they occur.

Lifestyle tips

• Quit smoking if you smoke.
• Manage stress with relaxation techniques or hobbies.
• Avoid heavy lifting or straining during bowel movements (drink plenty of water and eat fibre).
• Follow your doctor's advice about physical activity – moderate exercise like walking is usually fine.

Diet and exercise

Eat a heart-healthy diet rich in fruits, vegetables, whole grains, and lean proteins. This helps control blood pressure and cholesterol. Moderate exercise, such as walking for 30 minutes most days, is generally safe. Always check with your doctor before starting any new exercise program.

Mental health and emotional wellbeing

Learning that you have an aneurysm can be worrying. It is normal to feel anxious or fearful. Talk to your doctor, a counsellor, or a support group. Remember that most small aneurysms never cause problems and are safely monitored.

Prevention

It is not always possible to prevent AAA, but you can lower your risk by not smoking, managing high blood pressure and cholesterol, eating a healthy diet, and staying active. These steps also reduce your risk of heart disease and stroke.

Screening programmes

In the UK, men are invited for AAA screening once when they turn 65. In the US, the US Preventive Services Task Force recommends one-time screening for men aged 65 to 75 who have ever smoked. If you have a family history of AAA or other risk factors, talk to your doctor about whether screening is right for you at a younger age.

Complications

If left untreated

• The main complication is rupture (bursting) of the aneurysm, which causes life-threatening internal bleeding.
• A ruptured AAA is a medical emergency that requires immediate surgery.

Long-term outlook

With early detection, small AAA can be safely monitored for years. For larger aneurysms, surgical repair is very successful and the outlook is excellent when done before rupture. The key is to stay on top of your check-ups, keep a healthy lifestyle, and know when to seek emergency help.

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