OverviewCraniotomy is a surgery to cut a bony opening in the skull. A section of the skull, called a bone flap, is removed to access the brain underneath. A craniotomy may be small or large depending on the problem. It may be performed to treat brain tumors, hematomas (blood clots), aneurysms or AVMs, traumatic head injury, foreign objects (bullets), swelling of the brain, or infection. The bone flap is usually replaced at the end of the procedure with tiny plates and screws. Show What is a craniotomy?Craniotomies are named according to the area of skull (cranium) to be removed (Fig. 1). After the surgeon repairs the problem, the bone flap is then replaced or covered with plates and screws. If the bone flap is not replaced, the procedure is called a craniectomy. Figure 1. Craniotomies are often named for the bone being removed. Some common craniotomies include frontotemporal, parietal, temporal, and suboccipital.Craniotomies vary in size and complexity. Small dime-sized craniotomies are called burr holes; "keyhole" craniotomies are quarter-sized or larger. Stereotactic frames, image-guided computer systems, or endoscopes may be used to precisely place instruments through these small holes. Burr holes and keyholes are used for minimally invasive procedures to:
Complex skull base craniotomies involve the removal of bone that supports the bottom of the brain where delicate cranial nerves, arteries, and veins exit the skull. Reconstruction of the skull base may require the additional expertise of head-and-neck, otologic, or plastic surgeons. Surgeons often use image-guidance systems to plan the access for difficult-to-reach lesions to:
While most skull openings are made as small as possible, large decompressive craniectomies are made to allow the brain to swell after a head trauma or stroke. The bone flap is frozen and replaced months later after recovery (cranioplasty). Awake craniotomies are performed when a lesion is close to critical speech areas. The patient is asleep for the bone opening and then awakened to help the surgeon map areas at risk. A probe is placed on the brain surface while you read or talk. Called brain mapping, this process identifies your unique brain areas for speech and helps the surgeon avoid and protect these functions. There are many kinds of craniotomies. Ask your neurosurgeon to describe where the skin incision will be made and the amount of bone removal. Who performs the procedure?A craniotomy is performed by a neurosurgeon; some have additional training in skull base surgery. A neurosurgeon may work with a team of head-and-neck, otologic, oculoplastic and reconstructive surgeons. Ask your neurosurgeon about their training, especially if your case is complex. What happens before surgery?The surgeon will explain the procedure, its risks and benefits, and you will have time to ask questions. Consent forms are signed and paperwork completed to inform the surgeon about your medical history (e.g., allergies, medicines, anesthesia reactions, previous surgeries). Presurgical tests (e.g., blood test, electrocardiogram, chest X-ray) may need to be done several days before surgery. Consult your primary care physician about stopping certain medications and ensure you are cleared for surgery. Stop taking all non-steroidal anti-inflammatory medicines (ibuprofen, naproxen, etc.) and blood thinners (Coumadin, aspirin, Plavix, etc.) 7 days before surgery. Stop using nicotine and drinking alcohol 1 week before and 2 weeks after surgery to avoid bleeding and healing problems. If image-guided surgery is planned, an MRI will be scheduled before surgery. Fiducials (small markers) may be placed on your forehead and behind the ears. The markers help align the preoperative MRI to the image guidance system. The fiducials must stay in place and cannot be moved or removed prior to surgery to ensure the accuracy of the scan. You may be asked to wash your skin and hair with Hibiclens (CHG) or Dial soap before surgery. It kills bacteria and reduces surgical site infections. (Avoid getting CHG in eyes, ears, nose or genital areas.) Morning of surgery
Patients are admitted to the hospital the morning of surgery. The nurse will explain the preoperative process and discuss any questions you may have. An anesthesiologist will talk with you to explain the effects of anesthesia and its risks. What happens during surgery?Depending on the underlying problem being treated, the surgery can take 3 to 5 hours or longer. Step 1: prepare the patient If image-guidance is used, your head will be registered with the infrared cameras to correlate the “real patient” to the 3D computer model created from your MRI scans. The system functions as a GPS to help plan the craniotomy and locate the lesion. Instruments are detected by the cameras and displayed on the computer model. Step 2: make a skin incision Step 3: perform a craniotomy, open the skull Step 4: expose
the brain Step 5: correct the
problem Step 6: close the craniotomy What happens after surgery?You are taken to the recovery room where vital signs are monitored as you awake from anesthesia. You may have a sore throat from the tube used to assist your breathing. After you awaken, you’ll be moved to the intensive care unit (ICU) for close monitoring. You are frequently asked to move your arms, fingers, toes, and legs. A nurse will check your pupils with a flashlight and ask questions, such as "What is your name?" You may experience nausea and headache after surgery. Medication can control these symptoms. Depending on the type of brain surgery, steroid medication (to control brain swelling) and anticonvulsant medication (to prevent seizures) may be given. When your condition stabilizes, you’ll be transferred to a regular room where you’ll begin to increase your activity level. The length of the hospital stay varies, from only 2–3 days or 2 weeks depending on the surgery and any complications. When released from the hospital, you’ll be given discharge instructions. Follow the surgeon’s home care instructions for 2 weeks after surgery or until your follow-up appointment. In general, you can expect: Restrictions
Incision Care
Medications
Activity
When to Call Your Doctor
RecoveryA follow-up appointment is made 10 to 14 days after surgery. The recovery time varies from 1 to 4 weeks depending on the underlying disease being treated and your general health. Full recovery may take up to 8 weeks. Walking is a good way to begin increasing your activity level. Do not overextend yourself, especially if you are continuing treatment with radiation or chemotherapy. Ask your surgeon when you can expect to return to work. What are the risks?No surgery is without risks. General complications of any surgery include bleeding, infection, blood clots, and reactions to anesthesia. Specific complications related to a craniotomy may include stroke, seizures, swelling of the brain, nerve damage, cerebrospinal fluid leak, and loss of some mental functions. What are the results?The results of your craniotomy depend on the underlying condition being treated. Sources & linksIf you have more questions, please contact Mayfield Brain & Spine at 800-325-7787 or 513-221-1100. Glossarybiopsy: a sample of tissue cells for examination under a microscope to determine the existence or cause of a disease. burr hole: a small dime-sized hole made in the skull. cerebrospinal fluid (CSF): a clear fluid produced by the choroid plexus in the ventricles of the brain that bathes the brain and spinal cord giving them support and buoyancy to protect from injury. craniectomy: surgical removal of a portion of the skull. craniotome: a special saw with a footplate that allows cutting of the skull without cutting the dura mater. craniotomy: surgical opening of a portion of the skull to gain access to the intracranial structures and replacement of the bone flap. dura mater: the outer protective covering of the brain. endoscopic-assisted surgery: a procedure using a probe (endoscope) fitted with a tiny camera and light, which is inserted through a small keyhole craniotomy to remove a tumor. laser: a device that emits a narrow intense beam of energy to shrink and cut tissue. lesion: a general term that refers to any change in tissue, such as tumor, blood, malformation, infection or scar tissue. minimally invasive surgery: use of technology (e.g., endoscopes, cameras, image-guidance systems, robotics) to operate through small, keyhole incisions in the body. image-guided surgery: use of preoperative CT or MRI scans and a computer workstation to guide surgery. seizure: uncontrollable convulsion, spasm, or series of jerking movements of the face, trunk, arms, or legs. shunt: a drainage tube to move cerebrospinal fluid from inside the ventricles of the brain into another body cavity (e.g., abdomen). stroke: a condition caused by interruption of the blood supply to the brain; may cause loss of ability to speak or to move parts of the body. stereotactic: a precise method for locating deep brain structures by the use of 3-dimensional coordinates. ultrasonic aspirator: a surgical tool that uses a fine jet of water, ultrasonic vibration, and suction to break up and remove lesions. updated > 1.2021 |