Craniotomy is a surgical procedure designed to address serious brain conditions by temporarily removing a section of the skull to access the brain. This operation plays a vital role in treating tumors, blood clots, aneurysms, and other life-threatening problems, with the primary aim of relieving symptoms, restoring function, and improving a patient’s quality of life.

Understanding the Purpose Behind Skull Surgery

When the brain experiences serious problems such as tumors, bleeding, or swelling, treatment often requires direct surgical access to affected areas. A craniotomy is the most common approach used by neurosurgeons to treat these conditions. During this operation, a surgeon removes a portion of the skull—called a bone flap—to reach the brain and perform necessary repairs or interventions. Once the procedure is complete, the bone flap is carefully replaced and secured in position using small titanium plates and screws.^[1][2]

The goal of craniotomy varies depending on the specific condition being treated. For patients with brain tumors, surgery may remove cancerous or benign growths that threaten healthy tissue. In cases of bleeding within the skull, the procedure can remove blood clots or repair damaged blood vessels. When swelling builds up inside the brain after injury or stroke, surgery helps relieve dangerous pressure. The operation also treats bulging blood vessels known as aneurysms, tangled blood vessel formations called arteriovenous malformations, and severe forms of epilepsy that do not respond to medication.^[1][3]

Treatment decisions depend heavily on the stage and severity of the disease, the location of the problem within the brain, and the patient’s overall health condition. Medical teams follow established guidelines from professional societies while also considering emerging research into new surgical techniques and technologies that may offer additional benefits in specific situations.^[2]

Different Approaches to Opening the Skull

Not all craniotomies are performed the same way. Surgeons name different types of craniotomy procedures based on which part of the skull they remove to access the brain. A frontal craniotomy involves removing bone from the front of the skull near the hairline, while a temporal craniotomy focuses on the area next to the eyes and in front of the ear. A parietal craniotomy addresses the top-middle and upper back regions of the skull.^[2]

One particularly common approach is called a pterional craniotomy, also known as frontotemporal craniotomy. This technique removes part of the skull on the side of the head behind the temple. Surgeons use this approach to treat brain aneurysms, tumors, blood clots, epilepsy, and arteriovenous malformations. Sometimes a smaller version called a pterional keyhole craniotomy is performed, which removes even less bone.^[1]

Other specialized approaches include supraorbital craniotomy, which removes an area just above the eye socket through a short incision hidden in the eyebrow—sometimes called an eyebrow craniotomy. The retrosigmoid or keyhole craniotomy involves a small incision behind the ear, while a suboccipital craniotomy accesses the base of the skull above the neck.^[1][2]

The location and size of the skull opening depends entirely on where the brain problem lies and what the surgeon needs to accomplish. Modern surgeons strive to make openings as small as possible while still allowing safe and effective treatment. Advances in technology, including the use of specialized microscopes, high-definition cameras, and computer-guided navigation systems, help surgeons work through smaller openings with greater precision.^[7]

Preparing for Brain Surgery

Before undergoing craniotomy, patients meet extensively with their surgical team to plan every detail of the procedure. The surgeon orders various diagnostic tests to assess the patient’s overall health and to create detailed maps of the brain that guide surgical planning. Common tests include blood work, physical examinations, and imaging studies such as magnetic resonance imaging (MRI), computed tomography (CT) scans, positron emission tomography (PET) scans, or angiography—a special imaging technique that visualizes blood vessels.^[2][6]

These imaging tests serve multiple purposes. They help the surgeon identify the exact location and extent of the problem within the brain. They also reveal important anatomical details about nearby blood vessels and critical brain structures that control speech, movement, sensation, or other vital functions. The anesthesiologist—the doctor responsible for managing pain and consciousness during surgery—also uses these test results to determine the safest approach for anesthesia.^[2]

In the days leading up to surgery, patients receive specific instructions about how to prepare. Most patients must arrive at the hospital with an empty stomach, having fasted for several hours before the scheduled procedure. Those taking blood-thinning medications typically need to stop these drugs three to ten days before surgery to reduce bleeding risk. Some patients receive antibiotics, medications to prevent seizures called anticonvulsants, or corticosteroids to reduce brain swelling before the day of surgery arrives.^[2][6]

What Happens During the Operation

On the day of craniotomy, patients receive anesthesia to prevent pain and, in most cases, to keep them unconscious throughout the procedure. In the operating room, the surgical team carefully positions the patient’s head and body to ensure proper access to the treatment area while avoiding pressure on any body parts. The surgeon begins by shaving any hair near where the incision will be made, then thoroughly sterilizes the scalp using iodine or alcohol to kill germs and reduce infection risk.^[2][8]

The surgeon makes an incision through the skin and carefully separates the layers of tissue to expose the skull bone beneath. Using specialized surgical tools including a cranial drill called a perforator, the surgeon creates several small holes in the skull bone. These holes, called burr holes, act as starting points. An instrument called a craniotome—a specialized saw designed for cutting bone—connects these burr holes to create a removable bone flap. The size and shape of this bone flap depends on which area of the brain needs treatment.^[2][3]

Once the bone flap is removed, the surgeon opens the dura mater, the tough protective membrane that covers the brain. With the brain now accessible, the surgeon performs whatever treatment the patient needs. This might involve removing a tumor, repairing a damaged blood vessel, draining a blood clot, treating an aneurysm, removing abnormal tissue causing seizures, or relieving dangerous pressure. Some procedures involve implanting medical devices such as stimulators to help control movement disorders or seizures.^[1][7]

In certain cases, patients remain awake during part of the surgery—a technique called awake craniotomy. This approach sounds frightening, but the brain itself cannot feel pain. Surgeons use awake craniotomy when operating near areas controlling critical functions like speech or movement. By having patients speak, move their limbs, or perform other tasks during surgery, surgeons can identify and protect these essential areas, reducing the risk of permanent damage.^[11]

After completing the necessary brain work, the surgeon closes the protective membrane over the brain, replaces the bone flap in its original position, and secures it using titanium plates and screws. These metal fixation devices remain permanently in place. The surgeon then stitches together the layers of tissue and skin. A drainage tube may be placed inside the brain to remove any excess blood or fluid that accumulates after surgery. The entire procedure typically takes about two and a half hours, though complex cases may require longer.^[2][5]

Immediate Recovery Following Surgery

After craniotomy, patients typically spend time in an intensive care unit where medical staff closely monitor vital signs, neurological status, and pain levels. The breathing tube used during anesthesia remains in place until the patient fully recovers from anesthesia effects. Hospital stays generally last between three and seven days, though individual recovery times vary considerably depending on the specific procedure performed and the patient’s condition.^[2][5]

Experiencing discomfort after craniotomy is normal and expected. Most patients report headaches for several days following surgery, and many feel tired or weak. The incision site may feel sore, numb, or cause shooting pains. Swelling and bruising around the eyes commonly occurs. These symptoms gradually improve as healing progresses. Doctors prescribe pain medications to manage discomfort and help patients feel as comfortable as possible during the initial recovery period.^[5][15]

For patients whose heads were shaved for surgery, wearing hats or scarves provides comfort and confidence until hair regrows. The stitches or staples holding the incision closed are typically removed seven to ten days after surgery, though some modern surgical techniques use dissolving stitches that do not require removal.^[2][15]

Some patients require additional support beyond basic hospital care. Those who experience significant neurological effects from their brain condition or surgery may transfer to a short-term rehabilitation center before going home. Rehabilitation programs help patients relearn skills needed for daily living and provide intensive therapy to maximize recovery.^[5]

Continuing Recovery at Home

Full recovery from craniotomy is a gradual process that unfolds over weeks to months. Most patients find they need one to two months before returning to normal activities, though the exact timeline varies greatly depending on the nature and extent of surgery, whether complications occurred, and individual healing rates.^[2][16]

During the first weeks at home, rest remains essential. Feeling unusually tired and needing daytime naps is completely normal and actually helps the body heal. Patients should plan for regular rest periods throughout each day. As strength returns, gradually increasing physical activity helps promote recovery. Walking a little more each day improves blood flow, prevents complications like pneumonia and constipation, and builds stamina. However, heavy lifting should be avoided until the doctor gives permission.^[15]

Several restrictions apply during the recovery period. Driving is not permitted until the surgical team confirms it is safe—this protects both the patient and others on the road, as reaction times and judgment may be temporarily impaired. Air travel may also require medical clearance. Risky activities such as climbing ladders should be avoided. Doctors provide specific guidance about when patients can resume work, exercise, and other normal activities.^[15]

Following medical instructions about medications is critical during recovery. Patients must take all prescribed antibiotics exactly as directed to prevent infection, even if they begin feeling better before finishing the course. Those receiving seizure prevention medications must take these drugs precisely on schedule. Pain medications should be used as prescribed, and patients should inform their doctors if pain relief is inadequate or if medications cause troublesome side effects.^[15]

Caring for the surgical incision properly helps prevent infection and promotes healing. Patients typically receive instructions about when they can shower or bathe and how to clean the surgical area gently with warm, soapy water. The incision should be patted dry rather than rubbed. Hair products, including dyes and coloring treatments, must be kept away from incisions until the doctor confirms the area has healed sufficiently. If strips of tape cover the incision, these should be left in place for about a week or until they fall off naturally.^[15]

Potential Complications and Risks

Like all major surgery, craniotomy carries risks of complications. Some risks are common to any surgical procedure—infection at the surgical site, bleeding, blood clots forming elsewhere in the body, and problems related to anesthesia. Pneumonia can develop in the lungs after surgery. Blood pressure may become unstable. These general surgical risks apply to craniotomy just as they do to other operations.^[2][6]

Other complications are specific to brain surgery. Brain swelling following the procedure can cause serious problems if not managed properly. Leakage of cerebrospinal fluid—the liquid that surrounds and cushions the brain—sometimes occurs. Seizures may develop after brain surgery, even in patients who never experienced them before. Some patients experience muscle weakness, changes in balance or coordination, or difficulty with memory or speech.^[6]

The specific risks a patient faces depend largely on which area of the brain undergoes surgery. Operations affecting regions that control speech may temporarily or, rarely, permanently affect the ability to communicate. Surgery near motor control areas can impact movement and coordination. The brain’s remarkable ability to adapt and reorganize itself—called neuroplasticity—often allows recovery of function over time, though this varies considerably among individuals.^[18]

Meningitis, an infection affecting the membranes surrounding the brain and spinal cord, occurs in approximately 0.8 to 1.5 percent of craniotomy patients. Both bacterial and viral forms can develop. Risk factors for developing meningitis include the use of steroid medications around the time of surgery, placement of drainage systems for cerebrospinal fluid, traumatic brain injuries, and contamination during the surgical procedure itself. Younger age, advanced age, previous infections, and inexperience of the surgical team can also increase risk.^[4]

Healthcare providers monitor patients carefully after surgery, watching for any signs that complications might be developing. Patients and families should know what symptoms require immediate medical attention: worsening headache that does not respond to pain medication, fever, increasing confusion or drowsiness, seizures, clear fluid leaking from the nose or incision, weakness or numbness in the arms or legs, vision problems, or difficulty speaking. Recognizing and reporting these warning signs quickly allows prompt treatment and prevents more serious problems.^[5]

Rehabilitation and Therapy Services

Many craniotomy patients benefit from rehabilitation services designed to help them regain lost abilities or learn to compensate for permanent changes. The specific types of therapy needed depend on which brain functions were affected by the original condition or by the surgery itself. A comprehensive rehabilitation program addresses physical, cognitive, and emotional recovery.^[18]

Physical therapy helps patients who experience weakness, balance problems, or coordination difficulties. Physical therapists design exercise programs that gradually rebuild strength and improve movement patterns. They teach patients safe ways to perform daily activities and recommend assistive devices when needed. For patients who cannot move one side of their body initially, intensive physical therapy often leads to significant improvement over time.^[5]

Occupational therapy focuses on helping patients relearn practical skills needed for independence in daily life. Occupational therapists work on tasks like dressing, bathing, preparing meals, managing medications, and using household tools safely. They may suggest modifications to the home environment that make activities easier and safer.^[18]

Speech-language pathology services address problems with communication and swallowing. Speech-language pathologists help patients who struggle to speak clearly, find the right words, understand language, or safely eat and drink. They use specialized techniques to improve these skills and teach compensatory strategies when full recovery is not possible.^[18]

Some patients experience cognitive changes affecting memory, attention, problem-solving, or processing speed. Cognitive rehabilitation helps address these challenges through exercises and strategies designed to improve brain function. The brain’s natural ability to create new connections and pathways continues throughout life, and targeted cognitive exercises can promote this healing process.^[18]

Additional Treatments Beyond Surgery

For many patients, craniotomy represents only one part of their overall treatment plan. This is particularly true for those undergoing surgery to remove cancerous brain tumors. Even when surgeons successfully remove a tumor, microscopic cancer cells may remain in the surrounding brain tissue. Additional treatments help destroy these remaining cells and reduce the chance of tumor recurrence.^[10][13]

Radiation therapy uses high-energy X-rays or other forms of radiation to kill cancer cells. It may be delivered from a machine outside the body in a series of daily treatments over several weeks. Radiation therapy can also be given in highly focused doses using specialized techniques like stereotactic radiosurgery, which concentrates radiation beams precisely on the tumor area while minimizing exposure to healthy brain tissue. The exact radiation approach depends on the tumor type, location, and size.^[13]

Chemotherapy involves using powerful drugs to kill cancer cells throughout the body. Chemotherapy medications can be taken by mouth as pills or given intravenously through a vein. Some chemotherapy drugs specifically target fast-growing cells like cancer. Others interfere with the mechanisms cancer cells use to grow and divide. Doctors often combine chemotherapy with radiation therapy, as the two treatments work through different mechanisms and may be more effective together than either treatment alone.^[10][13]

Patients treated for brain infections called abscesses receive antibiotics after surgery to ensure all infection-causing bacteria are eliminated. The specific antibiotic chosen depends on which organism caused the infection, and treatment typically continues for several weeks.^[13]

Those who underwent craniotomy for epilepsy—when surgery removes brain tissue causing seizures—usually continue taking anti-seizure medications after surgery. While surgery can significantly reduce or even eliminate seizures in many cases, medications often remain necessary to maintain seizure control.^[2]

Most common treatment methods

• Surgical Approaches Based on Location
  • Frontal craniotomy removes bone from the front of the skull near the hairline to access the front portion of the brain
  • Temporal craniotomy accesses areas next to the eyes and in front of the ear
  • Parietal craniotomy addresses the top-middle and upper back regions of the skull
  • Pterional or frontotemporal craniotomy removes skull bone on the side of the head behind the temple
  • Supraorbital craniotomy removes an area just above the eye socket through an incision hidden in the eyebrow
  • Retrosigmoid or keyhole craniotomy uses a small incision behind the ear
  • Suboccipital craniotomy accesses the base of the skull above the neck
• Minimally Invasive Techniques
  • Keyhole craniotomy creates openings as small as a dime to minimize tissue disruption
  • Image-guided or stereotactic craniotomy uses computers and three-dimensional imaging to precisely locate treatment areas
  • Endoscopic craniotomy involves placing a lighted tube with a camera through a small skull opening
• Specialized Surgical Approaches
  • Awake craniotomy keeps patients conscious during part of surgery when operating near areas controlling speech or movement
  • Microscope-assisted craniotomy allows surgeons to see fine details through powerful magnification
• Post-Surgical Cancer Treatments
  • Radiation therapy uses high-energy X-rays or gamma rays to destroy remaining cancer cells
  • Stereotactic radiosurgery delivers highly focused radiation doses to tumor areas
  • Chemotherapy uses medications taken by mouth or given intravenously to kill cancer cells throughout the body
• Rehabilitation Services
  • Physical therapy rebuilds strength and improves movement and balance
  • Occupational therapy helps patients relearn daily living skills
  • Speech-language pathology addresses communication and swallowing problems
  • Cognitive rehabilitation improves memory, attention, and problem-solving abilities
• Medication Management
  • Antibiotics prevent and treat infections
  • Anticonvulsants prevent seizures before and after surgery
  • Corticosteroids reduce brain swelling
  • Pain medications manage discomfort during recovery