A meningioma is a tumor that develops from the meninges, the layers of tissue that cover and protect the brain and spinal cord. Many meningiomas grow slowly and may not cause symptoms for years, while others can become large enough to press on nearby brain tissue, nerves or blood vessels.
When a meningioma is causing symptoms, growing significantly, or creating pressure on important structures, surgery may be recommended to remove the tumor. In other situations, particularly with a small and slow-growing tumor that is not causing symptoms, regular monitoring may be more appropriate.
If you are exploring brain tumor surgery, understanding how meningioma removal works can help you understand why the treatment plan depends so much on the tumor's location, size and characteristics.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
What Is a Meningioma?
Meningiomas are among the most common primary tumors affecting the brain and spinal cord. They arise from the meninges rather than from the brain tissue itself.
Most meningiomas are low grade and slow growing. However, meningiomas are classified into different grades based on their microscopic characteristics. Grade 1 tumors are the most common and generally grow slowly, while grade 2 and grade 3 tumors have a greater tendency to grow or return after treatment.
The grade is determined by examining tumor tissue under a microscope, usually after surgery or biopsy. It is an important part of deciding what treatment and follow-up may be needed.
Does Every Meningioma Need Surgery?
No. A meningioma does not automatically need to be removed as soon as it is discovered. If a small meningioma is not causing symptoms and appears to be growing slowly, doctors may recommend active surveillance. This involves regular MRI scans and clinical follow-up rather than immediate surgery.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Surgery becomes more likely when the tumor is causing symptoms, showing significant growth, putting pressure on the brain or other important structures, or when its characteristics suggest that treatment is needed.
The decision is based on factors such as:
- Tumor size
- Location
- Growth over time
- Symptoms
- Age and general health
- Tumor grade and other pathological findings
- Relationship with nearby nerves and blood vessels
When Is Meningioma Surgery Recommended?
Surgery may be recommended when removing the tumor is expected to provide a meaningful benefit and can be performed with an acceptable level of risk.
Common reasons include:
- Symptoms caused by the tumor: such as headaches, seizures, weakness, vision changes or problems with balance.
- Documented tumor growth: particularly when the tumor is becoming progressively larger.
- Pressure on the brain: a growing meningioma can compress nearby brain tissue.
- Pressure on important nerves or blood vessels: depending on the tumor's location.
- Large tumor size: particularly when it is producing symptoms or significant mass effect.
- Need for a definitive diagnosis: surgical removal can provide tissue for pathological and molecular assessment.
The decision is not based on size alone. A relatively small tumor in a particularly sensitive location may require more careful consideration than a larger tumor in an area that can be accessed safely.
How Is Meningioma Surgery Performed?
The exact operation depends on where the meningioma is located and how it relates to the surrounding brain, nerves, blood vessels and skull.
For many brain meningiomas, the procedure involves a craniotomy. The surgeon temporarily opens part of the skull to reach the tumor and then works carefully around the surrounding structures.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
The general steps may include:
- Reviewing detailed brain imaging to plan the safest surgical route.
- Administering anesthesia and positioning the patient appropriately.
- Creating an opening in the skull to access the tumor.
- Separating the meningioma from surrounding structures as safely as possible.
- Removing as much of the tumor as can safely be removed.
- Controlling bleeding and checking the surgical area.
- Closing the protective layers and replacing the section of skull.
Can the Entire Meningioma Be Removed?
Sometimes it can, but complete removal is not always the safest goal. A meningioma may be attached to or closely associated with important nerves, blood vessels, the brainstem or other critical structures. Attempting to remove every visible part of the tumor in such a situation could cause significant neurological damage.
The surgeon may therefore remove as much of the tumor as can safely be removed and leave a small portion behind. This is particularly relevant for meningiomas located in difficult areas such as the skull base or around major venous structures. In selected cases, the remaining tumor can be monitored with MRI or treated with focused radiation if necessary.
Leaving part of a meningioma behind does not necessarily mean that the operation was unsuccessful. It can be a deliberate decision to protect important brain functions.
What Happens If Some Meningioma Remains After Surgery?
The next step depends on the tumor's grade, size, location and appearance after surgery. For a small residual low-grade meningioma that is not causing problems, the medical team may recommend regular MRI monitoring.
If the remaining tumor shows growth, focused radiation or another treatment may be considered. Higher-grade tumors are more likely to require additional treatment after surgery.
Does Meningioma Surgery Cure the Tumor?
For some meningiomas, surgery can provide long-term control and may be considered curative when the tumor is completely removed and has favorable biological characteristics.
However, complete removal does not guarantee that a meningioma will never return. The risk of recurrence depends on factors including tumor grade, location and the amount of tumor remaining after surgery.
Higher-grade meningiomas have a greater tendency to recur and are more likely to require additional treatment and closer follow-up.
What Are the Risks of Meningioma Surgery?
Meningioma surgery carries risks like any major brain operation. The specific risks depend heavily on where the tumor is located. Potential complications include:
- Bleeding
- Infection
- Seizures
- Brain swelling
- Headaches or postoperative pain
- Weakness or numbness
- Speech or language difficulties
- Vision problems
- Balance or coordination difficulties
- Memory or cognitive changes
- Damage to nearby nerves or blood vessels
- Cerebrospinal fluid leakage
What Happens During Recovery After Meningioma Surgery?
Recovery varies depending on the size and location of the tumor, the extent of surgery and the person's general health. In the early days after surgery, patients may experience tiredness, headaches, nausea or temporary neurological symptoms. These may improve as the brain recovers and postoperative swelling settles.
Some patients return to many normal activities within several weeks, while others need several months to regain their previous level of function.
When neurological problems are present, rehabilitation may be recommended. Depending on the patient's needs, this can include physiotherapy, occupational therapy or speech and language therapy.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
How Does Meningioma Location Affect Surgery?
Location is one of the most important factors in planning meningioma surgery. For example, meningiomas may develop along different parts of the skull and brain coverings, including the:
- Convexity of the brain
- Falx or parasagittal region
- Sphenoid wing near the eye and skull base
- Skull base
- Petroclival region near the brainstem
- Areas close to major venous sinuses
A tumor on the outer surface of the brain may be relatively accessible, while a skull-base meningioma may be surrounded by important nerves and blood vessels. In such cases, complete removal may carry substantially greater risk.
*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.
Can a Meningioma Be Removed Without Brain Surgery?
In selected situations, yes. Not every meningioma requires open surgical removal. Small tumors in appropriate locations may sometimes be treated with stereotactic radiosurgery or another radiation-based technique.
Observation may also be appropriate when a tumor is small, slow-growing and not causing symptoms.
The choice between observation, surgery and radiation depends on the tumor's size, growth, location, grade, symptoms and the patient's overall circumstances.
What Is the Outlook After Meningioma Surgery?
The outlook for meningioma is often favorable, particularly for lower-grade tumors that can be safely and completely removed.
However, prognosis varies. Grade, tumor location, age, overall health, molecular characteristics and the amount of tumor remaining after surgery can all influence long-term outcomes.
Higher-grade meningiomas have a greater risk of recurrence and generally require closer monitoring and, in many cases, additional treatment.
For this reason, follow-up does not necessarily end when the operation is complete. Periodic MRI scans may be recommended to monitor for residual or recurrent tumor.
The Bottom Line
Meningioma surgery can remove a brain tumor and, in appropriately selected patients, provide long-term control of the disease. However, not every meningioma requires immediate surgery. Observation, radiation or surgery may be appropriate depending on the tumor's size, growth, location, symptoms and grade.
When surgery is recommended, the goal is usually to remove as much tumor as can be done safely while protecting the surrounding brain, nerves and blood vessels. Complete removal is possible for some meningiomas but may not be safe for tumors in complex locations.
If a small amount remains, it may be monitored or treated with radiation depending on the circumstances. Higher-grade meningiomas are more likely to require additional treatment and closer follow-up.
The most appropriate treatment is therefore determined not simply by the presence of a meningioma, but by where it is, how it is behaving, what grade it has, and how safely it can be treated while preserving neurological function.
