Why Brain Surgery Doesn't Hurt: Understanding Awake Craniotomy

The brain itself does not have the pain-sensing receptors found in many other parts of the body. However, this does not mean that brain surgery is completely painless or that anesthesia is unnecessary. Pain-sensitive structures include the:

• Scalp
• Skin
• Muscles and tissues around the skull
• Periosteum covering the skull
• Some structures surrounding the brain

During brain surgery, the neurosurgical and anesthesia teams carefully manage these areas using appropriate anesthesia and pain-control techniques. Once the surgeon is operating on the brain tissue itself, the brain does not directly register pain in the same way that the skin or other organs do. An awake craniotomy is a specialized neurosurgical procedure in which a patient is awake and able to communicate with the surgical team during part of the operation. The technique may be considered when a brain tumor or other lesion is located close to important functional areas of the brain. The main purpose is to allow the surgical team to identify and preserve critical brain functions while removing as much of the abnormal tissue as safely possible. It is not appropriate for every patient or every type of brain surgery.

The procedure generally involves several carefully planned stages.

The scalp is treated with local anesthetic to reduce pain from the surgical incision and other pain-sensitive tissues. The anesthesia team may also provide sedation to keep the patient comfortable during appropriate stages of the procedure.

The neurosurgeon carefully creates access to the brain through the skull. The patient does not feel pain from manipulation of the brain tissue itself, but the surgical team continues to monitor comfort and vital signs throughout the procedure.

For selected awake craniotomy procedures, the patient is brought to an appropriate level of alertness during the critical part of the surgery. The patient may be able to:

• Talk
• Count
• Name objects
• Answer questions
• Read
• Perform specific movements

The exact tasks depend on the location of the tumor and the brain functions being evaluated. One of the major advantages of an awake craniotomy is that the surgical team can monitor certain neurological functions while operating. Depending on the location of the lesion, the team may assess:

• Speech
• Language
• Movement
• Sensory responses
• Other relevant neurological functions

This can help the neurosurgeon identify functional areas that should be protected. Once the functional areas have been identified, the neurosurgeon works toward removing the tumor or abnormal tissue while preserving important neurological functions. The extent of resection depends on the tumor's location, type, relationship with functional brain tissue and the patient's individual circumstances.

The goal is not simply to keep the patient awake. Awake surgery can provide the surgical team with real-time information about how certain brain functions are responding during the procedure. For example, if a tumor is located near areas involved in speech, the patient may be asked to speak or perform language tasks. If the tumor is near an area controlling movement, the surgical team may monitor specific movements. This information can help the neurosurgeon distinguish between tissue that can potentially be removed and critical functional areas that should be preserved.

Patients may experience sensations during different stages of surgery, but the brain tissue itself does not sense pain. The scalp and other pain-sensitive structures are managed using local anesthesia and appropriate anesthesia techniques. Patients may experience sensations such as:

• Pressure
• Movement
• Touch
• Vibration
• Awareness of the surgical environment

The anesthesia and neurosurgical teams continuously monitor the patient and manage comfort throughout the procedure. The experience is different for every patient, and your neurosurgical team should explain what you may experience before surgery. An awake craniotomy may be considered when a tumor is located close to important functional regions of the brain. The procedure can allow the surgical team to assess neurological function during tumor removal. This is particularly relevant when a tumor is close to areas associated with:

• Speech
• Language
• Movement
• Other important neurological functions

The objective is to achieve the maximum safe removal of the tumor while minimizing the risk of neurological damage. Awake craniotomy is therefore a specialized technique, not a standard procedure for every brain tumor. When appropriately selected, awake craniotomy can provide several potential advantages.

The surgical team can assess specific neurological functions while operating.

Functional mapping can help identify areas that need to be preserved.

In selected cases, real-time functional information can help the neurosurgeon work toward removing as much tumor as safely possible.

The approach can be adapted to the patient's tumor location, neurological functions and overall clinical situation.

Like any brain surgery, an awake craniotomy carries potential risks. The risks depend on factors such as:

• Tumor location
• Tumor type
• Patient's overall health
• Surgical approach
• Relationship between the tumor and functional brain areas

Possible complications can include neurological deficits, seizures, infection, bleeding and other complications associated with brain surgery. The neurosurgical team evaluates the potential benefits and risks before recommending the procedure. Awake craniotomy may be considered for selected patients with:

• Brain tumors near speech or language areas
• Brain tumors close to motor areas
• Lesions located near other important functional regions
• Certain other neurological conditions requiring functional mapping

Not every patient with a brain tumor needs an awake craniotomy. The decision is made after evaluating brain imaging, tumor location, neurological function and the overall treatment plan. If you or a family member has been diagnosed with a brain tumor, choosing the appropriate neurosurgical treatment in Chennai requires an individualized assessment. At OLIR Super Speciality Hospital, Velachery, Chennai, patients can seek evaluation for neurological and neurosurgical conditions. The Neurology & Neurosurgery Department can assess the patient's symptoms, imaging and diagnosis and determine whether surgery or another treatment approach may be appropriate. For selected brain tumors located close to critical functional areas, the neurosurgical team may consider specialized techniques such as functional mapping or awake craniotomy when clinically appropriate.