Iliac Artery Aneurysm

Overview

An iliac artery aneurysm is a bulging or ballooning area in one of the iliac arteries. These are two large blood vessels in your lower belly and pelvis that carry blood to your legs. The bulge happens because the artery wall is weak. It can grow slowly and may not cause any symptoms. If it gets very large, there is a risk it could burst, which is a medical emergency.

Iliac artery aneurysms are uncommon. They are much less common than aneurysms of the main abdominal artery, the aorta. They often happen together with an aortic aneurysm.

Symptoms

Common symptoms

• Many people have no symptoms at all.
• A dull or vague pain in the lower belly, pelvis, groin, or lower back may occur.
• Sometimes a scan done for another reason finds the aneurysm.

Symptoms in children

• Iliac artery aneurysms are very rare in children. When they do happen, they may be linked to a connective tissue condition, infection, or injury, and a specialist should check them.

Symptoms in older adults

• Older adults may not notice any symptoms. The aneurysm is often found during tests for an abdominal aortic aneurysm or other circulation problem.
• Vague pelvic or back pain can be mistaken for arthritis or a muscle strain, so it is worth mentioning to your doctor if you have a known aneurysm.

Causes

Main causes

• The most common cause is weakening of the artery wall from hardening of the arteries.
• Less common causes include connective tissue disorders that weaken blood vessel walls, infection, injury, or previous surgery in the area.

Risk factors

• Older age.
• Smoking.
• High blood pressure.
• High cholesterol.
• Having an abdominal aortic aneurysm or a family history of aneurysm.
• Connective tissue conditions that affect blood vessels.
• Infection or injury involving the arteries.

When to see a doctor

See a doctor urgently if:

• You have sudden severe pain in your lower belly, pelvis, back, or groin.
• You feel faint, very dizzy, or unwell with pain.
• Your leg suddenly becomes cold, pale, painful, or numb.
• You have a known aneurysm and notice new or worsening symptoms.

Book a routine appointment if:

• You have a known iliac artery aneurysm and your follow-up scan is due.
• You have a family history of aortic or iliac aneurysm.
• You have ongoing pelvic, groin, or lower back pain that is not going away.
• You have been told you have an abdominal aortic aneurysm.

Diagnosis

Doctors usually find an iliac artery aneurysm with an imaging scan. This may happen during a check for another blood vessel problem, or because you have symptoms. Your doctor will ask about your health, examine you, and arrange the right scan.

Tests that may be done

• Ultrasound scan: a painless test that uses sound waves to show the size of the artery.
• CT angiogram: a detailed scan that uses X-rays and a dye to show the blood vessels.
• MRI or MR angiogram: another detailed scan that uses magnets and radio waves, sometimes without dye.
• Blood tests to check for infection or other health problems.

What to expect at your appointment

You may be asked to come back for regular scans to check the size of the aneurysm. Your care team will explain what the measurements mean and whether you need any treatment. Most visits are quick and do not require a hospital stay.

Treatment

Treatment depends on the size of the aneurysm, how fast it is growing, and whether it is causing symptoms. Small aneurysms are usually monitored. Larger, growing, or symptomatic aneurysms may need repair.

Self-care at home

• Stop smoking, and ask for support to help you quit.
• Eat a heart-healthy diet and stay active as advised by your doctor.
• Take any prescribed medicines as directed.
• Keep your blood pressure and cholesterol under control.
• Go to all scheduled follow-up scans and appointments.

Medical treatments

There is no medicine that makes an aneurysm shrink. Your care team may focus on lowering your risk of heart and blood vessel disease. They may prescribe medicines to control blood pressure and cholesterol, but only your clinician can decide what is right for you. If the aneurysm is large, growing quickly, or causing symptoms, a vascular specialist will discuss repair.

When is surgery considered?

Repair may be recommended if the aneurysm is large, growing quickly, causing symptoms, or at high risk of bursting. The two main ways to repair it are open surgery and endovascular repair. Endovascular repair uses a stent graft, a fabric tube held open by a metal mesh, placed inside the artery, often through a small cut in the groin. Your specialist will explain the risks and benefits of each option.

Living with this condition

Most people with a small iliac artery aneurysm live a normal life and simply have regular scans. Keep your appointments, know your numbers for blood pressure and cholesterol, and tell your doctor about any new pain or leg symptoms.

Lifestyle tips

• Do not smoke. Quitting is the single most helpful step for your blood vessels.
• Stay physically active within what feels safe for you.
• Limit alcohol and avoid recreational drugs.
• Manage stress and get enough sleep.
• Take medicines exactly as prescribed.

Diet and exercise

A heart-healthy diet rich in vegetables, fruit, whole grains, beans, and lean protein can help your blood vessels. Try to be active most days, such as walking, swimming, or cycling, if your doctor says it is safe. Build up slowly and stop if you get chest pain, severe shortness of breath, or leg pain.

Mental health and emotional wellbeing

Being told you have an aneurysm can make you feel anxious or worried. That is very common. Talking to your care team, family, or a counselor can help. If worry is affecting your sleep, mood, or daily life, ask for support.

Prevention

You cannot fully prevent an iliac artery aneurysm, but you can lower your risk by not smoking, keeping blood pressure and cholesterol in a healthy range, eating well, and staying active. If you already have an aneurysm, these steps can help stop it from growing.

Vaccines

There is no vaccine for iliac artery aneurysm. Keep up with routine vaccines recommended by your doctor, especially flu and pneumonia vaccines if you are older or have a long-term condition.

Screening programmes

There is no general screening program for iliac artery aneurysm. If you have an abdominal aortic aneurysm, a family history of aneurysm, or a connective tissue condition, your doctor may suggest scans. Ask your clinician whether screening is right for you.

Complications

If left untreated

• A large aneurysm can burst, which causes serious internal bleeding and is a medical emergency.
• Blood clots can form inside the aneurysm and block blood flow to the leg.
• The aneurysm can press on nearby nerves or organs, causing pain or other symptoms.
• Rarely, an infected aneurysm can cause fever and serious illness.

Long-term outlook

The outlook is good for many people, especially when an aneurysm is found early and watched closely. Small aneurysms often stay stable for years. If repair is needed, modern surgery and stent grafts are effective. Your care team will help you weigh the benefits and risks and support you through follow-up.

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