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Renal Aneurysms: When Should You Have Yours Repaired?

The biggest concern is that they could rupture

illustration of kidneys inside body

If you have a renal artery aneurysm — or a bulging, weakened area in the wall of an artery to your kidney — it could go unnoticed for some time.


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Renal artery aneurysms (RAAs) are rare (they occur in approximately 0.1% of the general population), but they typically don’t cause symptoms and are often found during medical imaging for unrelated reasons, says vascular surgeon Francis Caputo, MD.

These aneurysms can sometimes lead to high blood pressure (hypertension) or compromised kidney function. But the biggest concern is the risk that they could rupture – particularly with increased size of the aneurysm. Ruptured RAAs are associated with significant morbidity and mortality, says vascular surgeon Jarrad Rowse, MD.

Why do RAAs happen?

One explanation for RAA is atherosclerosis, or hardening of the arteries, which causes degeneration of the arterial wall. RAAs are also related to fibromuscular dysplasia, a disease that causes arteries to narrow, says vascular surgeon Sean Lyden, MD. Most people with this condition are 40 to 60 years old, and many are women.

According to one study, risk factors of RAA rupture include pregnancy, polyarteritis nodosa or large aneurysm size. Patients with these risk factors should be considered for a planned (elective) surgery before it becomes an emergency.

According to a study which looked at people with renal artery aneurysms that spontaneously ruptured, a few reasons you can develop one include:

  • Long-standing, untreated high blood pressure.
  • Blunt and penetrating trauma.
  • Recent surgery or radiation.

If you have difficult-to-control hypertension, bloody urine, or pain in your upper abdomen, back or side (also known as flank pain), your doctor may perform a computed tomography angiography (CTA) scan to determine if you have a RAA. This scan gives the best view of the aneurysm and arteries branching off of it in order to determine how best to repair the aneurysm, Dr. Caputo says.

When to treat RAAs and what’s the best treatment option?

Repair of RAAs is recommended for patients who have medically refractory hypertension, renal artery stenosis (narrowing of the artery), or symptoms (bloody urine or upper abdomen, back or side pain),­­­­ regardless of the size of the aneurysm.

Repair should be considered for patients with RAAs that aren’t causing symptoms if they are:

  • ​​Over 3 centimeters.
  • Rapidly growing.
  • In a woman of childbearing age.


RAAs can be repaired either with endovascular repair or open surgery. Endovascular repair is a minimally invasive procedure that’s done inside your blood vessels. This has advantages over open surgery, as there’s a lower risk of major adverse effects and shorter recovery time. However, not every RAA can be treated this way, Dr. Rowse says.

While 98% of aneurysms occur outside of the kidney, if they involve more than one branch, open surgery is the gold standard for repair. The goal is to preserve as many branches off of the aneurysm as possible.

Whether your doctor recommends an open or endovascular repair, there is no difference in the lessening of your kidney function.

What to expect from getting your RAA repaired

If your RAA can be treated with endovascular repair, you can expect to stay overnight in the hospital and return to normal activities in about a week. If an open operation is recommended, you can expect to be in the hospital for three to five days and back to regular activities within a month.

When looking to get a RAA repair, it’s important to go to a multispecialty hospital, Dr. Lyden stresses. Many of these repairs are performed with both urology and vascular surgeons to provide the best outcomes. Sometimes, repair is more complex and the kidney is removed so the aneurysm can be repaired. The kidney is then re-implanted, much like a kidney transplant, Dr. Lyden explains. This allows doctors to preserve the kidney during very complex procedures.


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