Brain Aneurysm Treatment: Endovascular and Surgical Options

Brain aneurysm treatment methods are a collection of medical procedures performed to repair bulges that develop due to structural weakening in the cerebral vessels and to eliminate the potential risk of bleeding. In current medical practice, these lesions are managed predominantly through endovascular, or closed intravascular, techniques that do not require opening the skull. These innovative approaches aim to reach the center of the problem by using the body’s natural vascular pathways without creating large incisions. Depending on the patient’s anatomical characteristics, open microsurgical interventions may also be included in the treatment process when necessary. The primary goal is to protect healthy brain tissue, support the restoration of vascular integrity, and isolate these potentially dangerous vascular enlargements from the circulatory system.

What Is a Brain Aneurysm and How Does It Develop?

The brain is the organ in the human body that requires the most energy and therefore the most intensive blood flow. This high energy demand is supplied by a highly complex and interconnected arterial network located at the base of the brain. A cerebral aneurysm, or brain aneurysm, is a structural weakness that develops at a specific point in the walls of these arteries. This condition can be compared to a weak point in the inner tube of a pressurized bicycle tire that bulges outward. Blood continuously striking the same point and creating pressure inside the vessel may gradually cause the vessel wall in that area to become thinner and balloon outward over the years.

Many different factors may underlie this structural weakening. Genetic predispositions inherited within the family may cause the vessel wall to be congenitally weak, while high blood pressure, atherosclerosis, severe infections, or systemic inflammatory conditions may accelerate the process. These bulges, which occur in a certain portion of the population, may remain the same size for years without causing any discomfort. In fact, many people spend a large part of their lives without knowing that they have such a bulge in the brain. Today, a large proportion of these vascular enlargements are detected incidentally on brain imaging performed because of dizziness, an examination after a traffic accident, or an entirely different medical concern.

What Are the Symptoms of a Brain Aneurysm and Which Complaints Can It Cause?

A small, unruptured brain aneurysm usually follows a silent course. However, if this bulge begins to grow over time, it may exert physical pressure on the surrounding sensitive brain tissues and nerves. Since the space inside the skull is very limited, even a millimetric enlargement that should not normally be present may produce warning signs. In symptomatic cases, the most common complaint reported by patients is a noticeable headache. The nature of this pain varies according to the part of the brain where the aneurysm is located and the nerves with which it comes into contact.

If the aneurysm grows directly along the pathway of the nerves controlling eye movements, visual problems may occur. Enlargements in the lateral or posterior regions of the brain may cause different neurological problems, such as loss of balance or sensation. Common symptoms that may be observed in patients include:

• Severe headache
• Drooping eyelid
• Double vision
• Blurred vision
• Pain behind the eye
• Numbness on one side of the face
• Difficulty concentrating
• Loss of balance

Why Is Brain Aneurysm Bleeding Dangerous and What Risks Does It Carry?

The greatest risk associated with a brain aneurysm is that the thinned vessel wall may suddenly rupture when it can no longer withstand the pressure of the blood. When this rupture occurs, high-pressure arterial blood rapidly spreads between the membranes surrounding the brain. This condition, known in medical literature as subarachnoid hemorrhage, is a very serious medical emergency. At the moment bleeding occurs, patients usually experience a sudden, thunderclap-like headache of an intensity they have never felt before.

The main reason this condition is life-threatening is that blood leaking into the cerebrospinal fluid can raise intracranial pressure to extremely high levels within seconds. The increased pressure makes it difficult for healthy brain tissue to receive oxygen. An even more concerning issue is that a bleeding aneurysm carries a risk of bleeding again within hours or days. The already damaged vessel structure becomes much more fragile after the first hemorrhage. Recurrent bleeding places a far greater strain on the brain than the initial hemorrhage and significantly reduces the chance of recovery. For this reason, a patient suspected of having aneurysmal bleeding must be transported to a fully equipped center as quickly as possible, and the bleeding aneurysm must be isolated from the circulation.

What Is Vasospasm After Brain Aneurysm Bleeding?

Brain tissue is nourished by blood flowing only through the inside of blood vessels. When blood escapes from the vessel and comes into contact with the outer surface of the brain or the space between its membranes, it is extremely irritating to the brain. When a subarachnoid hemorrhage occurs, certain chemical substances in the leaked blood come into contact with the outer surface of the cerebral vessels. Following this contact, the brain vessels reflexively attempt to protect themselves by contracting and narrowing. This vascular constriction is called vasospasm.

For a patient who survives aneurysmal bleeding, vasospasm is generally a hidden danger that develops during the days following the hemorrhage. As the vessels contract and their diameter narrows, the amount of oxygenated blood reaching normal areas of the brain decreases. This can be compared to squeezing a garden hose at one point; just as the water flow becomes weaker when the hose is compressed, blood flow also decreases in vessels affected by vasospasm. Brain cells that do not receive enough oxygen and nutrients may become unable to perform their functions. For this reason, patients whose aneurysms have ruptured and been treated are closely monitored in an intensive care unit for an extended period specifically because of the risk of vascular constriction.

When Should an Unruptured Brain Aneurysm Be Treated?

Not every brain aneurysm detected incidentally requires immediate intervention. The decision whether to treat an unruptured aneurysm is made by considering the patient’s overall health and the physical characteristics of the aneurysm. Small, regularly shaped aneurysms with an extremely low risk of rupture may sometimes be monitored for years using imaging methods alone. However, in some cases the aneurysm has a high potential for rupture, making preventive treatment necessary. The main factors evaluated when deciding between treatment and follow-up include:

• The diameter of the aneurysm
• The area of the brain where the aneurysm is located
• Irregularities in the shape of the aneurysm
• The growth rate of the aneurysm
• The patient’s age range
• The patient’s overall health
• Smoking
• The presence of high blood pressure
• A family history of brain hemorrhage

If follow-up examinations show that the aneurysm has increased in size or that small secondary protrusions have begun to form on the bulge, this indicates that the vessel wall is continuing to weaken. In such a situation, planning treatment is generally considered the safest approach because the risk of bleeding increases.

Which Imaging Methods Are Used to Diagnose a Brain Aneurysm?

Advanced radiological imaging devices are used to confirm the presence of brain aneurysms, map their location, and measure their size. Different devices may be preferred depending on how the patient arrives at the hospital and the urgency of the situation. In patients brought in with suspected acute bleeding, computed tomography angiography is the method that provides the fastest results. With this scan, which takes only seconds, the condition of the vessels and any possible aneurysm can be visualized very clearly together with the skull bones.

Magnetic resonance angiography is generally used in patients without symptoms or those undergoing routine examinations. The greatest advantage of this method is that it does not expose the patient to radiation. In many cases, a three-dimensional model of the cerebral vessels can be created without even administering an additional contrast agent through the patient’s vein. However, no matter how advanced these methods are, more dynamic imaging is required to visualize millimetric details and plan the procedure before treatment.

How Is Angiography (DSA) Performed in the Diagnosis of a Brain Aneurysm?

Angiography is considered the medical standard for diagnosing vascular diseases and evaluating all structural features of an aneurysm. Rather than taking a static photograph, this procedure resembles a dynamic video recording that shows blood flow through the vessels second by second. Thanks to the high resolution provided by this method, the size of the aneurysm, the width of the point where it connects to the main vessel, and its relationship with the surrounding small vessels can be examined in detail.

The procedure is performed in specially designed sterile angiography rooms within the hospital. Access is usually obtained through an artery in the groin and, in some cases, through an artery in the wrist. Only the access site is numbed with local anesthesia. Hair-thin flexible tubes are advanced through a very small sheath placed inside the vessel. There are no pain-sensing nerves on the inner surface of the blood vessels in the human body. Therefore, the patient does not feel pain as the tubes are advanced toward the cerebral vessels. Once the relevant area is reached, a contrast agent is administered briefly and a series of X-ray images is taken. Precise measurements made from these images allow the non-surgical treatment method to be planned with great accuracy.

What Are the Non-Surgical Closed Treatment Methods for Brain Aneurysms?

In the past, treating a brain aneurysm required open brain surgery, in which part of the skull was opened and the aneurysm was reached by passing through brain tissue. Today, advances in medical technology allow treatment to be performed through the vessels without opening the skull. In these endovascular closed methods, no new incision is made in the body; the patient’s own blood vessels are used as a natural tunnel.

Flexible, high-technology microcatheters introduced through a millimetric opening in the groin or arm can safely reach even the deepest regions of the brain. The most important difference between closed methods and open surgery is that the patient’s hospital stay is significantly shorter and recovery after the procedure is much faster. The type of closed technique to be used is determined individually according to the size and location of the aneurysm, the width of its neck, and the patient’s overall vascular structure.

How Is the Coil Method Performed in Brain Aneurysm Treatment?

The coil method, which forms the basis of closed aneurysm treatments and is the most frequently used procedure, involves filling the aneurysm with coils. This technique is generally preferred for aneurysms with a narrow neck that connect to the main vessel through a relatively small opening. During the procedure, the tip of a flexible microcatheter is advanced through the vessel and carefully positioned directly inside the aneurysm sac.

At this stage, very thin wires made of platinum, which are structurally much softer than human hair, are delivered into the aneurysm cavity through the catheter. As these platinum wires enter the cavity, they fold over themselves and form a soft mass. The aim is to fill the aneurysm completely with these wires and prevent blood from entering the area. Once blood flow is interrupted, a natural clotting process begins within the aneurysm. The clot and the platinum coils work together to isolate the aneurysm from the circulation. In this way, the blood pressure striking the weak point in the vessel wall is eliminated, and the risk of the aneurysm rupturing is intended to be greatly reduced. Patients who undergo coil treatment may be able to stand up and return to their daily lives within a short period if their general condition permits.

Why Is Balloon or Stent Support Necessary in the Treatment of Wide-Necked Brain Aneurysms?

Unfortunately, not every aneurysm has an ideal bowl-like shape. In some aneurysms, the point where the bulge joins the main vessel, known as the neck, is very wide. Attempting to fill such an aneurysm directly with platinum coils carries certain technical risks. The soft coils placed inside may protrude through the wide neck into the healthy main vessel and cause it to become blocked. In such situations, supportive technologies are used to make the procedure safer.

The first option is balloon assistance. A soft microballoon that can be temporarily inflated is placed in the main vessel immediately next to the aneurysm. When inflated, the balloon temporarily closes the wide neck of the aneurysm like a door. Once the coils have been safely placed inside, the balloon is deflated and completely removed. Another option is the use of a stent. A permanent thin metallic mesh tube is placed inside the vessel. This stent acts as a strong wall within the main vessel and permanently prevents the coils from falling out. Patients who receive a stent must use potent blood-thinning medications for a certain period before and after the procedure to prevent blood clots from forming on the new metal surface.

How Do Flow-Diverting Stents Work in Complex Brain Aneurysm Cases?

Conventional methods may not be sufficient for aneurysms that have reached a very large size or have a shape too complex to be filled with coils. Flow-diverting stents, developed for these highly specialized cases, provide a completely different physiological solution to the problem. In this method, no material is placed inside the aneurysm itself.

Instead, a specially designed, densely woven stent with very fine pores is positioned along the entire diseased segment of the main vessel. This tightly woven stent largely prevents blood flowing through the main vessel from entering the aneurysm and directs the blood forward in a straight line. When blood flow inside the aneurysm slows and becomes stagnant, spontaneous clotting begins within it. Over time, the body’s natural healing mechanisms become active. New cells cover the tiny pores of the stent, effectively rebuilding the vessel wall. This method has produced encouraging results in many complex cases that were previously considered extremely difficult to treat.

What Benefit Does the WEB Device Provide for a Ruptured Brain Aneurysm?

Aneurysms that develop at points where cerebral vessels divide into two or three branches are generally more difficult to treat because of their anatomical location. One of the latest technologies developed for wide-necked aneurysms located at these vascular bifurcations is the WEB device. This device, woven in the shape of a basket from flexible shape-memory nitinol wires, is placed directly inside the aneurysm rather than in the main vessel.

As soon as the device is released inside the aneurysm, it opens by itself, fills the entire volume of the sac, and seals the neck from within. The most important medical advantage of this innovative device is that it does not leave a foreign metal structure inside the main vessel, so there is no need to use potent blood-thinning medications after the procedure. This feature provides a major safety advantage, particularly in patients brought to the hospital urgently with a ruptured aneurysm. Administering blood-thinning medications to a patient who already has a brain hemorrhage may be risky because it can increase the existing bleeding. The WEB device removes this necessity and offers an important alternative in the treatment of ruptured aneurysm cases.

How Does the Anesthesia Process Progress During Brain Aneurysm Treatment?

These intravascular brain interventions require millimetric calculations and extraordinary precision. Even the slightest movement by the patient during the procedure may cause the catheters to touch an unintended area inside the vessel. For this reason, endovascular aneurysm treatments are performed under general anesthesia in an environment where the patient is fully asleep and remains completely still.

Throughout the procedure, the anesthesia team monitors the patient’s heart rhythm, blood pressure, and breathing second by second. Maintaining blood pressure balance is particularly vital in cases of ruptured aneurysm. The awakening process must also be managed very carefully once the procedure is completed. Straining, severe coughing, or agitation while emerging from anesthesia may suddenly increase intracranial pressure, so the awakening phase is intended to be very slow, gentle, and calm. Once awakened without complications, the patient is generally kept under observation in the intensive care unit for one day as a safety measure.

How Should Follow-Up and Recovery Proceed After Brain Aneurysm Treatment?

The treatment process is not considered completely finished once the patient is discharged after a successful procedure. The long-term stability of the coils, stents, or other materials placed inside the vessels is very important. Under the effect of blood pressure, the inserted coils may become slightly compacted over time, or small changes may occur around the neck of the aneurysm. For this reason, patients are expected to take care of their health and maintain a controlled lifestyle after discharge. Some of the factors that should be considered during and after the recovery period include:

• Blood pressure monitoring
• Regular medication use
• Compliance with follow-up appointments
• Smoking cessation
• Avoiding physical strain
• Healthy nutrition
• Stress management

During post-treatment follow-up, patients undergo imaging examinations at specific intervals. In the first months after the procedure, a non-contrast brain MRI is usually performed to assess the overall condition. At the sixth month and first-year follow-ups, angiography through the groin may be repeated to confirm that the intravascular materials are fully positioned and that the aneurysm has been permanently closed. In the following years, annual MR angiography is generally sufficient. Thanks to this disciplined follow-up program, even the smallest possible change can be detected early, appropriate precautions can be taken in time, and the patient can continue life in good health for many years.

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