Endovascular surgery is minimally invasive surgery performed inside your blood vessels. Instead of opening the body with large incisions, surgeons insert a needle into an artery (usually in the groin), thread a thin flexible tube called a catheter through the blood vessel, and guide it to the problem area using real-time X-ray imaging. The repair happens from inside the vessel, which means less blood loss, shorter hospital stays, and faster recovery compared to traditional open surgery.
How the Procedure Works
The basic principle is the same across most endovascular procedures. A surgeon makes a small puncture, typically in the femoral artery near the groin, and feeds a sheathed catheter through the blood vessel network until it reaches the damaged area. Live X-ray imaging (called fluoroscopy) lets the surgical team see exactly where the catheter is at all times. Once in position, the surgeon can deploy a stent graft to reinforce a weakened artery wall, inflate a tiny balloon to widen a narrowed vessel, break up or retrieve a blood clot, or seal off an abnormal connection between vessels.
Before any of this happens, detailed imaging maps out the territory. CT angiography is the preferred method for planning. It produces three-dimensional reconstructions of the blood vessels, showing the exact diameter, length, and shape of the area that needs repair. Pre-contrast images reveal calcium buildup in vessel walls, while post-contrast images highlight the blood flow path. MRI is sometimes used as an alternative, particularly for patients who can’t tolerate the contrast dye used in CT scans.
Conditions It Treats
Endovascular techniques now cover a wide range of vascular problems. The most common include aortic aneurysms (dangerous bulges in the body’s largest artery), peripheral artery disease (narrowed arteries in the legs), carotid artery disease (blocked arteries supplying the brain), and deep vein thrombosis (blood clots in deep veins). But the list extends much further: aortic dissections, arteriovenous malformations, renal artery narrowing, varicose veins, venous ulcers, and even rare conditions like nutcracker syndrome and pelvic congestion syndrome.
Two of the most well-known procedures are EVAR and TEVAR. EVAR (endovascular aneurysm repair) treats aneurysms in the abdominal aorta, while TEVAR (thoracic endovascular aortic repair, introduced in 1994) addresses aneurysms in the chest portion of the aorta. Both involve placing a fabric-covered stent graft inside the weakened artery to redirect blood flow away from the bulging wall, reducing the risk of rupture.
Endovascular vs. Open Surgery
The core advantage of endovascular repair is what it spares the patient. Compared to open surgery, it reduces blood loss, need for transfusions, time on a ventilator, procedure duration, and both intensive care and overall hospital stays. Recovery is substantially faster because there’s no large abdominal or chest incision healing.
The tradeoff is durability. For abdominal aortic aneurysms, the survival advantage of endovascular repair over open surgery tends to even out at roughly three to four years. For thoracic aneurysms, that advantage lasts longer, with survival curves not converging until about nine years. The thoracic aorta often has longer segments of healthy tissue where the stent graft can anchor securely, which helps explain the difference. Open repair, while harder to recover from initially, tends to hold up better over the long term, which is why younger, healthier patients are sometimes still recommended for the traditional approach.
Who Qualifies
Not everyone with a vascular problem is a candidate for endovascular repair. The anatomy of your blood vessels has to cooperate. Surgeons evaluate the diameter, shape, and angle of the vessels the catheter needs to travel through and the area where the stent will land. Severe tortuosity (sharp kinks or loops in the artery, particularly angles tighter than 90 degrees) can make it unsafe to navigate a catheter. Heavy calcium deposits in artery walls create barriers to access. Completely blocked arteries (chronic total occlusions) are generally not treated with endovascular methods.
Plaque composition also matters. Soft, unstable plaques carry a significantly higher risk of breaking apart during the procedure and sending debris into the bloodstream. One type of vulnerable plaque is associated with a 12-fold increased risk of loose debris during carotid artery stenting. Free-floating blood clots inside a vessel are considered especially dangerous because they can detach and travel to the brain with minimal manipulation.
Risks and Complications
Endovascular surgery is safer than open surgery in the short term, but it carries its own set of risks. The most common complication after aneurysm repair is an endoleak, where blood continues to flow into the aneurysm sac around or through the stent graft. Some endoleaks seal on their own; others require a second procedure to fix.
At the puncture site in the groin, hematomas (pockets of collected blood), infections, or fluid buildup occur in roughly 1 to 10 percent of cases. Most resolve with monitoring or minor treatment. Over longer timeframes, stent grafts can migrate from their original position, sometimes causing turbulent blood flow that leads to clotting within the graft. This is more of a concern four to five years after the initial procedure, which is why ongoing imaging follow-up is part of the deal with endovascular repair.
Recent Advances
The technology keeps evolving. In neurovascular care, newer devices for treating brain aneurysms are showing strong results. One intrasaccular device (a small implant placed inside the aneurysm itself) achieved complete closure in over 95 percent of cases in a pivotal trial of nearly 200 patients, with no permanent stroke-related deficits through three months. That’s a significant improvement over earlier devices of the same type, which achieved complete closure in only 50 to 60 percent of cases.
Robotic-assisted endovascular surgery has moved from animal models into initial human procedures, with surgeons using robotic systems to navigate catheters and deploy devices. The long-term goal is remote intervention, allowing specialists to treat patients in locations that lack access to experienced neurovascular surgeons. In another novel direction, an endovascular approach to treating hydrocephalus (fluid buildup in the brain) reached pilot trials in 2025, using a stent placed in a vein within the skull to drain excess fluid into the bloodstream, potentially offering an alternative to traditional brain shunts.