What is a craniotomy?
A craniotomy is the surgical removal of part of the bone from the skull to expose
the brain for surgery. The surgeon uses specialized tools to remove the section of
bone (the bone flap). After the brain surgery, the surgeon replaces the bone flap.
For some craniotomy procedures, doctors use computers and imaging (magnetic resonance
imaging [MRI] or computerized tomography [CT] scans). Imaging scans help guide the
doctor to the precise location within the brain that is to be treated. When imaging
procedures are used with craniotomy, it is called stereotactic craniotomy.
Brain imaging provides a three-dimensional (3-D) image of brain tissue. This helps
the doctor tell the difference between tumor tissue and healthy tissue. It also helps
map the precise location of the abnormal tissue.
Doctors may also use craniotomy to take a biopsy of the brain or remove fluid. An
endoscopic craniotomy involves inserting a lighted scope with a camera into the brain
through a small incision in the skull.
If a portion of the skull bone is removed and not immediately replaced, it is called
craniectomy. This is done if swelling is likely after brain surgery or if the skull
bone flap can't be replaced for other reasons. After a few months, you may have a
follow-up surgery called a cranioplasty. During a cranioplasty, the missing piece
of skull will be replaced with your original bone or a synthetic material.
Why might I need a craniotomy?
Doctors may do a craniotomy for a variety of reasons, including to:
- Diagnose, remove, or treat brain tumors
- Clip or repair an aneurysm
- Remove blood or blood clots from a leaking blood vessel
- Remove an arteriovenous malformation (AVM) (an abnormal mass of blood vessels)
- Drain a brain abscess (an infected pus-filled pocket)
- Repair skull fractures
- Repair a tear in the membrane lining the brain (dura mater)
- Relieve pressure within the brain (intracranial pressure) by removing damaged or swollen
areas of the brain that may be caused by traumatic injury or stroke
- Treat epilepsy (a neurological condition involving the brain that makes people more
susceptible to seizures)
- Implant stimulator devices to treat movement disorders such as Parkinson's disease
or dystonia (a type of movement disorder)
There may be other reasons for your doctor to recommend a craniotomy.
What are the risks of a craniotomy?
As with any surgical procedure, complications may occur. Brain surgery risk is tied
to the specific location in the brain that the operation will affect. For example,
if the area of the brain that controls speech is operated on, then speech may be affected.
Some more general complications include:
- Blood clot
- Pneumonia (infection of the lungs)
- Unstable blood pressure
- Muscle weakness
- Brain swelling
- Leakage of cerebrospinal fluid (the fluid that surrounds and cushions the brain)
- Risks associated with the use of general anesthesia
The following complications are rare and generally relate to specific locations within
- Memory problems
- Speech difficulty
- Abnormal balance or coordination
There may be other risks depending on your specific medical condition. Be sure to
discuss any concerns with your healthcare provider before the procedure.
How do I get ready for a craniotomy?
Check with your healthcare provider about what to do to prepare for the procedure.
Below is a list of common steps that you may be asked to do.
- You will be asked to sign a consent form that gives permission to do the surgery.
Read the form carefully and ask questions if something is not clear.
- In addition to a complete medical history, your doctor will do a physical exam to
make sure you are in otherwise good health before you undergo the surgery. You may
also need blood tests and other diagnostic tests.
- You will have a neurological exam before surgery that will be compared with one done
- You will be asked to fast before the procedure, generally after midnight.
- If you are pregnant or think you might be, tell your doctor.
- Tell your doctor if you are sensitive to or are allergic to any medicine, latex, tape
and anesthetic agents (local or general).
- Tell your doctor of all medicines (prescribed and over-the-counter) and herbal supplements
that you are taking.
- Tell your doctor if you have a history of bleeding disorders or if you are taking
any anticoagulant (blood-thinning) medicine, aspirin, or other medicine that affects
blood clotting. You may need to stop these before the procedure.
- If you smoke, you should stop smoking as soon as possible before the procedure to
improve your chances for a successful recovery.
- You may be asked to wash your hair with a special antiseptic shampoo the night before
- You may receive a sedative before the procedure to help you relax.
- Based on your condition, your doctor may request other specific preparation.
What happens during a craniotomy?
A craniotomy generally requires a hospital stay of 3 to 7 days. You may also go to
a rehabilitation unit for several days after your hospital stay. Procedures may vary
depending on your condition and your doctor's practices.
Generally, a craniotomy follows this process:
- You will remove any clothing, jewelry, or other objects that may interfere with the
procedure and put on a hospital gown.
- An intravenous (IV) line will be inserted in your arm or hand.
- A urinary catheter will be inserted to drain your urine.
- You will be positioned on the operating table to provide the best access to the side
of the brain to be operated on.
- The anesthesiologist will continuously monitor your heart rate, blood pressure, breathing,
and blood oxygen level during the surgery.
- Your head will be shaved and the skin over the surgical site will be cleaned with
an antiseptic solution.
- Various types of incisions may be used, depending on the affected area of the brain.
If an endoscope is used, the incisions may be smaller.
- Your head will be held in place by a Mayfield 3 pin head holder or similar device,
which will be removed at the end of the surgery.
- The scalp will be pulled up and clipped to control bleeding while providing access
to the brain.
- A medical drill may be used to make burr holes in the skull. A special saw may be
used to carefully cut the bone.
- The bone flap will be removed and saved.
- The thick outer covering of the brain directly underneath the bone (dura mater) will
be separated from the bone and carefully cut open to expose the brain.
Excess fluid will be allowed to flow out of the brain, if needed. Your surgeon may
use microsurgical instruments, such as a surgical microscope to magnify the area being
treated. This gives the surgeon a better view of the brain
What happens after a craniotomy?
In the hospital
Right after the procedure, you will be taken to a recovery room to be watched before
being taken to the intensive care unit (ICU) to be closely monitored. Or you may be
taken directly to the ICU from the operating room.
In the ICU, you may be given medicine to decrease the brain swelling.
Your recovery will vary depending on the type of procedure done and the type of anesthesia
you had. Once your blood pressure, pulse, and breathing are stable and you are alert,
you may be taken to the ICU or your hospital room.
After staying in the ICU, you will move to a room in the hospital. You will stay in
the hospital for several more days.
You may need oxygen for a while after surgery. Generally, the oxygen will be stopped
before you go home.
You will be taught deep-breathing exercises to help re-expand the lungs and prevent
Medical staff will check your brain function often and make sure your body systems
are working properly after surgery. To check your brain function, you will be asked
to follow a variety of basic commands, such as moving your arms and legs. Your pupils
will be checked with a flashlight, and you will be asked questions to assess your
awareness. These might include your name, the date, and where you are. The staff will
test the strength of your arms and legs.
The head of your bed may be raised to prevent swelling of your face and head. Some
swelling is normal.
You will be encouraged to move around as you are able while in bed. As your strength
improves, you will have help to get out of bed and walk around. A physical therapist
(PT) may evaluate your strength, balance, and mobility, and give you suggestions for
exercises to do both in the hospital and at home.
You will likely have sequential compression devices (SCDs) placed on your legs while
you are in bed to prevent blood clots. SCDs have an air compressor that slowly pumps
air into and out of fitted sleeves that are placed on the legs. They help prevent
blood clots by passively compressing the leg veins to keep blood moving.
Depending on your situation, you may be given liquids to drink a few hours after surgery.
Your diet may be gradually changed to include more solid foods, as you can tolerate
You may have a catheter in your bladder to drain your urine for a day or so, or until
you are able to get out of bed and move around. Be sure to report any painful urination
or other urinary symptoms that occur after the catheter is removed, as these may be
signs of an infection that can be treated.
Depending on your status, you may be moved to a rehabilitation facility for a period
to regain your strength.
Before you are discharged from the hospital, arrangements will be made for a follow-up
visit with your doctor. Your healthcare provider will also give you instructions for
Once you are home, it is important to keep the incision clean and dry. Your doctor
will give you specific bathing instructions.
You may choose to wear a loose turban or hat over the incision. Do not wear a wig
until the incision is completely healed (about 3 to 4 weeks after surgery).
The incision and head may ache, especially with deep breathing, coughing, and exertion.
Take a pain reliever for soreness as recommended by your healthcare provider. Aspirin
or other blood thinning medicines may increase the chance of bleeding. Be sure to
take only recommended medicines and ask if you are unsure.
Continue the breathing exercises used in the hospital to prevent lung infection. You
will be advised to avoid exposure to upper respiratory infections (colds and flu)
and irritants, such as tobacco smoke, fumes, and environmental pollution.
Gradually increase your physical activity as tolerated. It may take several weeks
to return to your previous level of energy and strength.
You may be instructed to avoid lifting heavy items for several weeks to prevent strain
on your surgical incision.
Do not drive until your doctor gives you permission.
Tell your doctor to report any of the following:
- Fever or chills
- Redness, swelling, bleeding, or drainage from the incision site or face
- Increased pain around the incision site
- Vision changes
- Confusion or excessive sleepiness
- Weakness of your arms or legs
- Speech difficulty
- Difficulty breathing, chest pain, anxiety, or change in mental status
- Green, yellow, or blood-tinged sputum (phlegm)
- Seizure activity
Following a craniotomy, your healthcare provider may give you other instructions about
what to do after a craniotomy.
Before you agree to the test or the procedure make sure you know:
- The name of the test or procedure
- The reason you are having the test or procedure
- What results to expect and what they mean
- The risks and benefits of the test or procedure
- What the possible side effects or complications are
- When and where you are to have the test or procedure
- Who will do the test or procedure and what that person’s qualifications are
- What would happen if you did not have the test or procedure
- Any alternative tests or procedures to think about
- When and how will you get the results
- Who to call after the test or procedure if you have questions or problems
- How much will you have to pay for the test or procedure