Burr Hole Surgery

What this procedure is

A burr hole is a small opening made in the skull. It is a common way for surgeons to reach the brain or the area around it without needing a large incision. This procedure is often used to relieve pressure on the brain or to help doctors see what is happening inside the head.

During the procedure, a neurosurgeon (a doctor who specializes in the brain and spine) uses a special tool to create the small hole. This allows them to drain fluid or use small instruments to treat a specific area. Because the opening is small, it is often considered a less invasive option compared to other types of brain surgery.

What it treats or fixes

Your clinician may recommend a burr hole to treat several different conditions. One of the most common reasons is to drain a subdural hematoma, which is a buildup of blood between the brain and its outer covering. This buildup can put pressure on the brain, and the burr hole allows the blood to be safely removed.

Other reasons for this procedure include:

• Draining an abscess: Removing a pocket of infection or fluid.
• Relieving pressure: Lowering the pressure inside the skull caused by injury or illness.
• Taking a biopsy: Removing a tiny piece of tissue to test it in a lab.
• Placing a monitor: Inserting a small device to track the pressure inside your head.

How common it is & where it's done

Burr hole surgery is a standard procedure performed in hospitals across North America. It is usually done in an operating room under the care of a specialized surgical team. Depending on the situation, the procedure may be planned in advance or done as an emergency to quickly relieve pressure on the brain.

While it is a serious procedure, it is a routine part of neurosurgery. Your medical team will monitor you closely before, during, and after the surgery to ensure you are comfortable and safe. Most patients stay in the hospital for a short time afterward so clinicians can check on their recovery.

Recovery: What to Expect

After the procedure, most people stay in the hospital for a few days so the care team can monitor their progress. You may feel tired or have a mild headache as you begin to heal. Your clinician will provide specific instructions on how to care for the small incision (cut) and keep the area clean and dry.

• Activity: You will likely need to rest and avoid heavy lifting or intense exercise for several weeks to allow your body to recover.
• Follow-up: Your clinician will usually remove any stitches or staples about 7 to 14 days after the surgery.
• When to call your clinician: Contact your care team if you notice a fever, increased redness or swelling at the site, or a headache that gets worse instead of better.

Risks & Possible Complications

While this procedure is a common way to relieve pressure on the brain, all surgeries carry some risks. Your surgical team takes many steps to keep you safe during and after the process. Your clinician may discuss these possibilities with you before the procedure to ensure you are well-informed.

Possible complications may include:

• Infection at the site of the incision.
• Bleeding in the area where the surgery was performed.
• A small risk of seizures or a stroke.
• A reaction to the anesthesia (the medicine used to make you sleep during surgery).

Outcomes & Long-Term Results

The main goal of a burr hole procedure is to reduce pressure inside the skull, often by draining excess fluid or blood. Many patients notice an improvement in their symptoms—such as confusion, weakness, or persistent headaches—shortly after the pressure is relieved.

Long-term results are generally positive. Most people are able to return to their daily routines once the brain has had enough time to heal. Your clinician may schedule follow-up imaging, such as a CT scan, to ensure the area remains clear and that you are recovering as expected.

Emotional Support & Reassurance

It is completely normal to feel nervous about any procedure involving the head. Remember that burr hole surgery is a standard and effective way to help the brain heal by relieving harmful pressure. Your medical team is highly trained to guide you through every step of the process and monitor your safety.

Focusing on your recovery one day at a time can help manage any anxiety. Do not hesitate to ask your clinician questions or share your concerns; they are there to support both your physical health and your peace of mind during this time.

Why doctors recommend it

Doctors usually recommend a burr hole procedure when there is too much pressure inside the skull. Because the skull is a hard bone, it cannot expand. If fluid, blood, or other materials build up, they can push against the brain and cause damage. Your clinician may suggest this surgery to create a small opening that allows that pressure to be released.

Common reasons for this recommendation include:

• Subdural hematoma: A collection of blood that forms between the brain and its outer covering, often after a head injury.
• Hydrocephalus: A buildup of extra fluid in the brain's natural cavities.
• Brain biopsy: When a doctor needs to take a small sample of tissue to test for tumors or infections.
• Infections: To drain a pocket of infected fluid, known as an abscess, from the brain.

Urgent vs planned treatment

The timing of this surgery depends on how quickly the pressure is building up. In emergency situations, such as a sudden head injury that causes rapid bleeding, the procedure is often done immediately. This urgent care is meant to lower pressure quickly and prevent serious, long-term brain injury.

In other cases, the surgery is a planned part of your medical care. For example, if blood has been leaking slowly over several weeks (called a chronic hematoma), your clinician may schedule the procedure for a specific time. This allows the medical team to monitor your symptoms and ensure you are prepared for the surgery. Your clinician will decide the best timing based on your symptoms and imaging tests, like a CT scan.

Goals of treatment

The main goal of a burr hole procedure is to give the brain more room to function. By removing excess blood or fluid, the surgery aims to stop symptoms like headaches, confusion, or weakness from getting worse. Success is often measured by how well the pressure is lowered and how much your physical or mental symptoms improve.

Another important goal is diagnosis. If the procedure is used for a biopsy, the goal is to get an accurate sample of tissue so your care team can create a long-term treatment plan for you. While this surgery is often just one step in a larger recovery process, it is a vital tool for protecting the brain and helping your medical team understand the underlying cause of your condition.

Who may benefit

Burr hole surgery is often used to relieve pressure on the brain. This pressure can happen when fluid, such as blood or extra brain fluid, builds up inside the skull. Because the skull is hard and cannot expand, extra fluid can press against the brain and cause health problems. Your clinician may suggest this procedure to drain that fluid and reduce the pressure.

One common reason for this surgery is a subdural hematoma, which is a buildup of blood between the brain and its outer covering. It is also used to treat hydrocephalus, a condition where too much cerebrospinal fluid (the fluid that cushions the brain) collects in the brain's open spaces. By creating a small opening, the surgeon can allow this fluid to escape safely.

In other cases, this surgery helps your care team reach the brain for diagnostic reasons. This might include taking a biopsy, which is a small sample of tissue used to check for a tumor or infection. It can also be used to drain an abscess (a pocket of infection) or to help place medical devices, such as a shunt or a deep brain stimulator.

When it may not be the right option

While this procedure is less invasive than other brain surgeries, it is not always the best choice for every patient. If a blood buildup has become thick or has turned into a solid clot, a small burr hole may not be enough to drain it. In these cases, your clinician may recommend a craniotomy, which involves removing a larger piece of the skull to reach the area more effectively.

This surgery may also not be the right option if the problem is located in a part of the brain that is difficult to reach through a small opening. If a surgeon needs a wider view of the brain to repair a blood vessel or remove a large growth, they will likely choose a different surgical approach. Your care team will use imaging tests, like CT scans or MRIs, to decide which method is the safest and most effective for your specific needs.

Questions to ask your care team

It is natural to have questions before a procedure. Preparing a list of questions can help you feel more comfortable and informed about your care. Your clinician can provide specific details based on your health history.

You may want to ask your care team the following questions:

• Why is burr hole surgery the best choice for my condition compared to other options?
• What are the specific goals of this surgery for me?
• What are the most common risks or side effects I should watch for?
• How long will I likely need to stay in the hospital after the procedure?
• What will my recovery look like at home, and when can I return to my normal activities?
• Will I need follow-up scans to make sure the fluid or pressure has stayed away?

In the procedure room

When you arrive in the procedure room, the medical team will help you get into a comfortable position on the operating table. To prepare the area, a healthcare provider will clean a small section of your scalp with a special soap to kill germs. In some cases, they may trim or shave a small patch of hair to ensure the site is sterile (completely clean and free of bacteria).

The team will also set up sterile drapes around you. These are medical sheets that create a clean workspace for the surgeon and help prevent infection. You will likely have an intravenous (IV) line placed in your arm to provide fluids and medicine during the process.

High-level steps

The surgeon begins by making a small, careful incision (cut) in the scalp. Once the skull is reached, they use a specialized medical drill to create one or more small holes, each about the size of a coin. These are the "burr holes."

Through these holes, the surgeon can reach the space between the skull and the brain. They typically perform the following steps:

• Draining fluid: If there is a buildup of blood or fluid (such as a hematoma), the surgeon will allow it to drain out to relieve pressure on the brain.
• Placing a drain: Your clinician may leave a small, flexible tube in the hole for a day or two. This helps any remaining fluid continue to drain safely after the surgery is over.
• Closing the site: Once the procedure is finished, the surgeon will close the scalp incision using stitches, medical staples, or surgical glue.

Anesthesia and pain control

Your clinician may use general anesthesia, which is medicine that puts you into a deep sleep so you do not feel or remember the procedure. In some situations, they may use local anesthesia instead. This numbs only the specific area of your head being worked on while you remain awake but relaxed.

If you are awake, you may feel some pressure or hear sounds from the medical tools, but you should not feel sharp pain. The medical team will ensure you are as comfortable as possible throughout the process.

Monitoring and safety steps

Safety is the top priority during the procedure. The medical team uses electronic monitors to track your vital signs continuously. This includes your heart rate, blood pressure, and the amount of oxygen in your blood.

The surgical team also follows strict safety checklists. They verify your identity and the specific details of the procedure multiple times before starting. This careful monitoring continues from the moment you enter the room until you are moved to recovery.

Immediately after the procedure

After the surgery is finished, you will be moved to a recovery room. Nurses will check your alertness and vital signs frequently as the anesthesia wears off. You may have a thick bandage wrapped around your head to keep the incision clean and protected.

It is common to feel some soreness or numbness around the incision site. Your clinician may provide pain relief medicine to help with any discomfort. You might also feel a bit groggy or tired for a few hours after the procedure.

Typical procedure length

The surgery itself is relatively quick, usually lasting between 30 and 90 minutes. However, the total time you spend in the operating room may be longer. This extra time allows the team to set up the equipment, administer anesthesia, and ensure you are stable before moving you to the recovery area.

Common approaches (open vs minimally invasive)

Doctors typically choose the least invasive option that is safe for your specific condition. A burr hole procedure is considered minimally invasive. During this surgery, the surgeon drills one or two small holes into the skull. This allows them to insert a drain or needle to remove fluid, such as blood or pus, without making a large opening.

In contrast, an open craniotomy is a more extensive approach. This involves removing a larger piece of the skull (a bone flap) to see and reach the brain. Your clinician may recommend an open approach if the problem is too complex to be fixed through a small hole, or if the blood clot is too solid to drain easily.

Partial vs total

When discussing brain surgery, these terms often refer to the amount of access the surgeon creates. A burr hole provides limited, or partial, access to the brain. It is ideal for targeted tasks, such as draining a subdural hematoma (a pool of blood) or taking a small tissue sample (biopsy).

Because the opening is small, this approach is not always applicable for every condition. If the surgeon needs to remove a large tumor or repair a wide area of damage, they generally need the total access provided by a craniotomy. While a burr hole is less invasive, it does not allow the doctor to view the brain as fully as open surgery does.

Revision or repeat procedures

While many procedures are successful the first time, there is a chance that treatment may need to be repeated. For example, if a hematoma comes back after being drained, your doctor may need to perform a revision surgery to drain the fluid again.

In some cases, if a burr hole does not fully solve the problem, the medical team may decide to perform a craniotomy for the second procedure. This allows them to clear out any remaining fluid or tissue that could not be reached through the smaller holes.

Tests and imaging that may be done

To plan the surgery safely, your healthcare team needs a detailed map of your brain. Your doctor will likely order imaging tests to see exactly where fluid or blood may have collected. These images help the surgeon decide the best place to make the small opening.

• CT scan: This test uses X-rays to create detailed pictures of the inside of your head.
• MRI: This scan uses magnets and radio waves to create clear images of the brain and surrounding tissue.

Medication adjustments

Your doctor will review all the medicines, vitamins, and supplements you currently take. You may need to pause certain drugs for a short time before the procedure. This often includes blood thinners, which are medications that prevent clots but can increase the risk of bleeding during surgery.

It is very important to follow your care team's schedule for your medications exactly. Only stop medicines if your clinician instructs you to do so.

Day-before and day-of instructions

Your medical team will give you a specific list of steps to follow as your surgery date approaches. These steps help lower the risk of infection and complications.

• Fasting: You will likely be told not to eat or drink anything for a set period before the surgery, often starting the night before.
• Hygiene: You may need to wash your hair with a special soap or shampoo to clean your scalp.
• Hair removal: The medical team will usually shave the small area of your scalp where the procedure will be done. You generally do not need to do this yourself.
• Transportation: You will not be able to drive immediately after the procedure, so you must arrange for someone to drive you home.

General surgical risks

Like any operation, burr hole surgery carries some standard risks. Your healthcare team takes many precautions to keep you safe, but it is helpful to be aware of potential issues that can happen with any medical procedure.

• Reaction to anesthesia: Some patients may have a reaction to the medication used to put them to sleep.
• Infection: Bacteria can sometimes enter the incision site or the area around the skull.
• Bleeding: There is a small risk of bleeding at the surgical site.
• Blood clots: Lying still during and after surgery can increase the chance of clots forming in the veins.

Procedure-specific complications

Because this surgery involves the head and brain, there are specific side effects your doctor will watch for. These complications are not guaranteed to happen, but they are possibilities your clinician will discuss with you.

• Seizures: The irritation to the brain tissue can sometimes trigger a seizure.
• Brain swelling: The brain may swell in response to the procedure.
• Recurrence: In some cases, the fluid or blood may build up again after it has been drained.
• Need for further surgery: If the burr hole does not drain enough fluid, or if the fluid returns, another operation might be necessary.

How complications are treated

Your medical team monitors you closely after surgery to catch and treat any problems early. For example, doctors often prescribe antibiotics to help prevent or treat infections. You will likely have follow-up imaging tests, such as CT scans, to make sure the brain is healing correctly and that swelling is going down.

If complications like seizures occur, medication can help manage them. If the fluid builds up again, your doctor may suggest repeating the procedure or using a different method to drain the area. Most people recover well with proper monitoring and care.

Pain control medicines

After a burr hole procedure, it is common to have some soreness where the small holes were made in the skull. Your clinician may recommend over-the-counter pain relievers, such as acetaminophen, to help you feel more comfortable during recovery. In some situations, they might provide a prescription for stronger pain medicine for a short time.

Your healthcare team will tailor your pain management plan based on your health history. Be sure to mention any allergies or past reactions to medications. They will help you find the right balance so you can rest and heal without feeling too much discomfort.

Antibiotics

Antibiotics are medicines used to prevent or treat infections caused by bacteria. Because any surgery carries a small risk of infection, your clinician may give you these medicines before the procedure begins. This is often done through an IV, which is a small tube placed in a vein.

In some cases, you may be asked to continue taking antibiotic tablets for a short time after you leave the hospital. It is important to follow the instructions provided by your care team and report any signs of a reaction, such as a rash or upset stomach, to your clinician.

Blood thinners and clot prevention

If you take blood thinners—medicines that help prevent blood clots—your clinician may give you specific instructions on how to manage them. You might be asked to stop taking these medications several days before the surgery to lower the risk of bleeding. Common examples include aspirin or other prescription anticoagulants.

After the surgery, your team will focus on keeping your blood moving safely. They may suggest the following to prevent new clots from forming while you recover:

• Gentle movement: Walking short distances as soon as your clinician says it is safe.
• Compression: Using special leg wraps or stockings that help with circulation.
• Medication adjustment: Your clinician will tell you exactly when it is safe to restart your usual blood-thinning medicines.

Emergency warning signs

While recovering, some symptoms require immediate attention. You or a caregiver should call 911 or go to the nearest emergency room if you experience signs of a serious complication, such as a heart attack, stroke, or blood clot.

Seek emergency care immediately for:

• Seizures (convulsions or shaking).
• Trouble breathing or shortness of breath.
• Chest pain or pressure.
• Sudden weakness or numbness, especially in the arms or legs.
• Vision changes or trouble speaking.

Call your surgeon or clinic if…

Other symptoms may not be life-threatening emergencies but still indicate a problem, such as an infection or an issue with the healing process. Contact your healthcare provider right away if you notice:

• Fever or chills.
• Incision issues, such as redness, swelling, or fluid (pus) draining from the cut.
• A stiff neck.
• Headache that does not go away or gets worse.
• Nausea or vomiting.
• New confusion or memory problems.

Expected vs concerning symptoms

After a burr hole procedure, your care team will monitor you closely to ensure the brain is recovering. It is standard to have follow-up appointments and imaging scans (like a CT scan or MRI) to check that the bleeding has stopped and the brain has expanded back to its normal position.

However, complications can happen. In some cases, the bleeding (hematoma) can return. It is concerning if you notice the return of any symptoms you had before the surgery, such as weakness or confusion. If you feel like your recovery is sliding backward or if new neurological symptoms appear, let your doctor know immediately.

Non-surgical treatments

In some cases, your clinician may suggest treatments that do not involve surgery. These options are often used when the pressure on the brain is mild or the cause is a small amount of fluid. If the symptoms are not life-threatening, the medical team may try to manage the condition with medicine first.

Medications are a common non-surgical approach. Your care team might use diuretics (medicines that help the body get rid of extra fluid) or corticosteroids to help reduce swelling in the brain tissue. These treatments aim to lower the pressure inside the skull without an invasive procedure.

Watchful waiting

If a person has a very small collection of blood or fluid and is not showing severe symptoms, a clinician might recommend "watchful waiting." This means the medical team will monitor the situation closely rather than performing surgery right away. This is common for small subdural hematomas (blood collections) that are not causing much pressure.

During this time, you may have regular imaging tests, such as CT scans or MRIs. These tests allow doctors to see if the fluid is being naturally reabsorbed by the body or if it is getting larger. This approach is often used when the patient is stable and the risk of surgery might outweigh the benefits at that moment.

When surgery becomes the best option

Surgery often becomes the best choice if non-surgical methods are not working or if the situation is urgent. If a hematoma is large or putting significant pressure on the brain, a burr hole may be necessary to prevent permanent damage. The procedure is designed to quickly release that pressure.

Your clinician may decide surgery is the best path if you experience certain "red flag" symptoms or changes, such as:

• Worsening headaches or increased confusion.
• New weakness in the arms or legs.
• Signs of high pressure inside the skull shown on a brain scan.
• Seizures or a decrease in alertness.

When these signs appear, the medical team usually moves quickly to perform the procedure. Releasing the trapped fluid can help the brain return to its normal position and may help symptoms improve rapidly.

Hospital services that commonly perform this surgery

Burr hole surgery is typically performed in hospitals that have a specialized neurosurgery department. This department focuses on conditions affecting the brain, spine, and nervous system. Because this procedure is often used to treat emergencies, such as a subdural hematoma (a buildup of blood on the brain), it may begin in the emergency room before moving to a surgical suite.

After the procedure, patients are often monitored in an Intensive Care Unit (ICU) or a dedicated neurological care floor. These units have staff trained specifically to watch for changes in brain function and ensure a safe recovery. Your clinician may also coordinate care with the radiology department for follow-up imaging, such as CT scans, to check the results of the surgery.

Patient resources and support services

Many hospitals offer support services to help patients and families navigate the recovery process. Social workers and case managers are often available to assist with discharge planning, helping you arrange for any medical equipment or home care you might need after leaving the hospital.

Recovery resources may also include:

• Physical and Occupational Therapy: Specialists who help you regain strength or manage daily tasks if the brain condition affected your movement.
• Speech-Language Pathology: Experts who can help if the condition impacted communication or swallowing.
• Patient Education: Most facilities provide written guides on wound care and signs of infection to watch for at home.
• Support Groups: Many facilities host groups for individuals recovering from neurological conditions, providing a space to share experiences and find community.

Questions for choosing where to have surgery

When choosing a facility for a planned procedure, or when reviewing care after an emergency, you may want to ask the following questions:

• Does this hospital have a dedicated neurosurgery team available at all times?
• Is there a specialized neurological intensive care unit (Neuro-ICU) for recovery?
• What kind of rehabilitation services are available on-site or through hospital partners?
• How does the surgical team communicate updates to family members during and after the procedure?
• What is the typical follow-up schedule for monitoring recovery after a burr hole procedure?

Conditions commonly treated by this procedure

Burr hole surgery is often used to relieve pressure on the brain caused by fluid or blood. One common reason for this procedure is a subdural hematoma. This is a buildup of blood between the brain and its outer covering, which can happen after a head injury.

Other conditions your clinician may treat with this procedure include:

• Hydrocephalus: A buildup of extra fluid in the brain's natural cavities.
• Brain Abscess: An area of infection that causes swelling and pressure.
• Epidural Hematoma: Blood that collects between the skull and the brain's protective lining.

In some cases, a clinician may use a burr hole to take a small tissue sample, called a biopsy, to check for brain tumors or other issues.

Related symptoms people search for

Symptoms associated with these conditions often involve increased pressure inside the skull. These signs can develop quickly or slowly over time. You may notice a persistent headache, feeling unusually sleepy, or sudden confusion.

Other symptoms that people often search for include:

• Weakness or numbness in the arms or legs.
• Changes in vision or difficulty speaking.
• Nausea and vomiting.
• Problems with balance or walking.

Because these symptoms can be linked to many different health concerns, they require a professional medical evaluation to determine the cause and the best treatment plan.

Evidence overview

Burr hole surgery is a standard medical procedure primarily used to relieve pressure on the brain. It is a well-established treatment for a condition called a subdural hematoma, which occurs when blood collects between the brain and its outer covering. By creating a small opening, surgeons can drain the accumulated blood to prevent damage caused by pressure inside the skull.

Beyond treating blood clots, this procedure is used to manage other conditions that increase pressure, such as hydrocephalus (a buildup of fluid) or a brain abscess. It is also the standard method for performing a brain biopsy, where a small tissue sample is taken for testing. The choice to perform this surgery is based on clinical evidence regarding the need to reduce intracranial pressure safely.

Safety notes and individualized care

As with any surgery, there are risks involved. Potential complications can include bleeding, infection, or the formation of blood clots. Some patients may experience seizures or swelling in the brain following the procedure. There are also general risks associated with anesthesia and heart health during surgery.

Your healthcare team will create a care plan specific to your health history to manage these risks. To support a safe recovery, your clinician may prescribe antibiotics to prevent infection or medication to help prevent seizures. You will likely stay in the hospital for monitoring immediately after the surgery.

Follow-up care is essential for safety. Your doctor will typically order imaging tests, such as CT scans, to verify that the pressure has been relieved and that the brain is healing as expected.

Sources used

The content for this section is based on established medical information regarding neurosurgical procedures. It draws on patient education materials from reputable medical information platforms that review standard surgical practices, risks, and recovery protocols.