Aneurysm treatment ranges from regular monitoring with no surgery at all to emergency open surgery, depending on the aneurysm’s size, location, and whether it has ruptured. The two most common locations are the brain and the aorta (the large artery running from your chest to your abdomen), and each has its own set of treatment options. Here’s what those treatments look like and what to expect from each.
When Treatment Isn’t Surgery
Many aneurysms, particularly small unruptured ones, don’t need immediate surgical intervention. Instead, your care team will focus on managing the factors that could cause the aneurysm to grow or burst. Blood pressure control is the cornerstone of this approach. The American Heart Association and American Stroke Association classify hypertension management as a top-priority recommendation for people with unruptured brain aneurysms, since high blood pressure contributes to both aneurysm growth and rupture risk.
Beyond blood pressure, you’ll typically be advised to quit smoking, limit alcohol, and avoid straining activities that spike pressure in your blood vessels. Some research has explored whether cholesterol-lowering medications or calcium channel blockers might slow aneurysm formation, but the evidence so far hasn’t supported routine use of these drugs for prevention. The practical reality for most people with a small, stable aneurysm is periodic imaging (usually every 6 to 12 months initially) to check whether it’s growing, combined with aggressive management of cardiovascular risk factors.
Surgical Clipping for Brain Aneurysms
Surgical clipping is the traditional open-surgery approach for brain aneurysms. A neurosurgeon opens a section of the skull, locates the aneurysm, and places a small metal clip across its base to seal it off from normal blood flow. This permanently prevents blood from entering the weakened area.
Clipping has a strong track record for durability. In a meta-analysis comparing it to catheter-based alternatives for a common type of brain aneurysm, clipping achieved complete closure in about 94% of cases (609 out of 647 aneurysms). It also has lower recurrence rates, meaning the aneurysm is less likely to refill after treatment. The tradeoff is that it’s a more invasive procedure requiring general anesthesia and a craniotomy (opening the skull), which means a longer recovery. Hospital stays after open aneurysm surgery typically last 3 to 10 days, and full recovery takes 4 to 6 weeks for most people, though some need 2 to 3 months.
Endovascular Coiling for Brain Aneurysms
Coiling is the less invasive alternative. Instead of opening the skull, a surgeon threads a thin catheter through an artery in your groin or wrist, guides it up to the aneurysm, and fills the bulge with tiny platinum coils. These coils promote clotting inside the aneurysm, effectively blocking it off. The advantages are meaningful: shorter procedure times, less anesthesia, and the ability to treat multiple aneurysms in different locations during the same session.
The limitation is that coiling doesn’t seal aneurysms as completely as clipping. In the same comparative analysis, complete occlusion was achieved in about 86% of coiled aneurysms (185 of 215), and the recurrence rate was higher and tended to occur earlier. Coiling also carried a higher rate of minor complications, roughly four to five times that of clipping. Still, for aneurysms that are difficult to reach surgically, or for patients who can’t tolerate open surgery, coiling is often the better option.
Flow Diverters for Complex Aneurysms
Some brain aneurysms have wide necks or unusual shapes that make both clipping and coiling difficult. For these cases, flow diverter stents offer another option. A flow diverter is a mesh tube placed inside the parent artery across the opening of the aneurysm. It redirects blood flow away from the aneurysm and encourages the vessel wall to heal over it.
In a large national study tracking outcomes at 12 months, flow diverters achieved satisfactory closure in about 80% of cases, with a serious complication rate of 5.9% and a mortality rate of 1.2%. Certain factors predicted worse outcomes: patients with high blood pressure, diabetes, or larger aneurysms were more likely to experience neurological complications. Aneurysms that had been previously treated with other methods also showed a trend toward lower success rates with flow diversion. This technology works best for sidewall aneurysms along the length of an artery rather than those sitting at a branch point.
Treating Aortic Aneurysms
Aortic aneurysms, most commonly in the abdomen, follow a similar decision tree: watch and wait for smaller ones, intervene for larger or fast-growing ones. The threshold for repair is generally around 5.5 centimeters in diameter for most patients, though it may be lower for women or people with certain connective tissue disorders.
The two main surgical options mirror the brain aneurysm choices. Open surgical repair involves clamping the aorta, removing the weakened section, and replacing it with a synthetic graft. Endovascular aneurysm repair (EVAR) threads a stent graft through arteries in the groin and anchors it inside the aorta, reinforcing the wall without opening the abdomen.
EVAR is generally chosen for older patients and those with significant health problems like heart failure, kidney issues, or limited mobility. These patients tend to tolerate the shorter, less invasive procedure better in the short term. Open repair, however, has shown superior long-term durability. In a study of frail Medicare patients, there was no survival difference in the first five months after surgery, but patients who had open repair had significantly better survival at two years. The catch is that open repair carries a much higher rate of serious cardiac events in the perioperative period: 21% compared to 6% for EVAR.
What Happens in an Emergency Rupture
A ruptured aneurysm is a life-threatening emergency that requires immediate intervention. For brain aneurysms, the first priorities are stabilizing blood pressure and managing the pressure buildup inside the skull. If a large blood clot has formed in the brain tissue, emergency surgery to open the skull and clip the aneurysm is often performed simultaneously with clot removal. When the rupture causes fluid to accumulate in the brain’s ventricle system (a condition called acute hydrocephalus), a drainage tube is placed at the bedside to relieve pressure before definitive treatment.
For ruptured aortic aneurysms, the situation is similarly urgent. Patients are rushed to surgery for either open repair or, if their anatomy allows it, emergency endovascular stent placement. Survival depends heavily on how quickly treatment begins.
Complication Risks During Treatment
All aneurysm procedures carry risks, and understanding the numbers can help you weigh your options. For endovascular treatment of unruptured brain aneurysms, one study of 443 procedures found an overall complication rate of about 11%. The most common issue was ischemic events (temporary or permanent reduction in blood flow to the brain), occurring in roughly 9% of cases. Actual rupture during the procedure was rare, happening in less than 1% of cases. Of all complications, about 6% resolved by the time the patient was discharged, while roughly 5% resulted in lasting effects.
Long-Term Follow-Up After Repair
Treatment doesn’t end when you leave the hospital. Both brain and aortic aneurysm repairs require ongoing surveillance imaging to catch recurrence, new aneurysms, or complications with the repair itself.
After endovascular repair of an aortic aneurysm, the standard protocol starts with a CT scan and ultrasound within the first month. If everything looks clean (no leaks around the stent graft, no growth of the aneurysm sac), you move to annual imaging, typically with ultrasound. If a leak or enlargement is detected, a repeat scan at six months is recommended. Any new leak, graft shifting, or growth of 5 millimeters or more on ultrasound triggers a full contrast CT scan. Even after open surgical repair, imaging of the entire aorta is recommended every five years.
For brain aneurysms, follow-up imaging schedules vary, but coiled aneurysms generally require more frequent monitoring than clipped ones due to their higher recurrence rates. Your neurosurgeon will typically schedule imaging at 6 months, 1 year, and then at longer intervals if the aneurysm remains stable. Because people who have had one brain aneurysm are at higher risk of developing new ones, long-term surveillance often continues indefinitely.