Could that constant headache be a meningioma? Let's explore what you need to know about this brain tumor.

Have you ever worried that a strange headache might be something serious inside your head? Hearing that you or a loved one might have a growth near the brain can feel very scary and overwhelming right away. The good news is that most growths in this area are not dangerous or fast-spreading cancers. Today, we will talk about a very common type of growth that forms in the protective layers around your brain, known medically as a meningioma. Let us break down what this condition means, how doctors find it, and what treatment choices you might face.

Your brain and spinal cord are extremely delicate and precious parts of your body. Because they do such important work, nature protects them with three special layers of tissue. These protective membranes are called the meninges, and they act much like a sturdy cover wrapped around a book. A meningioma starts in specific cells within these meninges, most often from a layer called the arachnoid cells.

Most meningiomas grow very slowly over many years in the space around the brain or spinal cord. Because they grow so slowly, they can sometimes become quite large before you ever notice any warning signs. Even though a meningioma is usually benign (meaning non-cancerous), a large growth can press against nearby brain tissue and cause serious health concerns. Understanding how these growths behave helps you work better with your doctor to plan your care.

What is a Meningioma?

A meningioma is a tumor that forms in the meninges, which are the protective layers covering your brain and spinal cord. While people often call any head growth a brain tumor, meningiomas actually start in the tissue covering the brain rather than inside the brain tissue itself. They are the most often diagnosed type of tumor that forms inside the skull.

Most of these growths develop over the outer surface of the brain or along the base of the skull. Rarely, they can form along the spinal canal. Because they usually grow at a very slow pace, many people live with a small meningioma for years without ever knowing it is there. However, if the tumor expands too much, it puts pressure on nearby blood vessels and nerves, leading to noticeable physical symptoms.

Are There Different Grades of Meningiomas?

Doctors divide meningiomas into three main clinical grades based on how the cells look under a microscope and how fast they grow:

• Grade I (Typical): These are non-cancerous or benign growths. They grow very slowly and make up about 80% of all cases.
• Grade II (Atypical): These are not technically cancer, but they grow faster than Grade I tumors and have a higher chance of returning after treatment. They make up about 17% of cases.
• Grade III (Anaplastic): These are malignant or cancerous meningiomas. They grow aggressively and can spread to other parts of the body, though this severe type is very rare at about 1.7% of cases.

Are There Types Based on Location?

Doctors also classify meningiomas by the exact spot where they form inside the skull. Common locations include:

• Convexity Meningiomas: These form on the outer surface of the brain under the skull bone.
• Intraventricular Meningiomas: These develop inside the fluid-filled chambers deep within the brain.
• Olfactory Groove Meningiomas: These grow at the base of the skull near the nerves that control your sense of smell.
• Sphenoid Wing Meningiomas: These form along the bony ridge located right behind your eyes.

Is a Meningioma Cancer?

This is one of the most common questions people ask when they hear this diagnosis. The reassuring answer is that the vast majority of meningiomas are benign, meaning they are not cancer. Only a small percentage fall into the aggressive Grade II or Grade III categories.

Even though most meningiomas are benign, size matters greatly. A non-cancerous growth that becomes very large can squeeze vital brain structures and cause life-threatening pressure. Therefore, every meningioma requires careful medical attention and regular monitoring.

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Who is Most Likely to Get a Meningioma?

Meningiomas are diagnosed most often in older adults, while children rarely develop them. The average age for finding a meningioma is around 66 years old. Statistics show that women are affected about twice as often as men, which strongly suggests that female hormones play a role in their development. Conversely, malignant meningiomas appear slightly more often in men.

How Common is This Condition?

Meningiomas are a relatively common type of health condition. They affect about 97 out of every 100,000 people. In the United States alone, tens of thousands of people are diagnosed each year. In fact, meningiomas account for the single largest category of primary brain tumors.

What Are the Symptoms of a Meningioma?

Because meningiomas grow so slowly, they often cause no outward symptoms until they grow large enough to press on surrounding brain tissue. The specific signs you feel depend entirely on where the growth is located inside your head.

For example, a growth near your olfactory nerves can cause you to lose your sense of smell completely, a condition called anosmia. A growth along the midline of the brain can weaken your legs. This a tumor near the sphenoid wing might cause your eyes to bulge forward. Here are the most common general signs of a brain meningioma:

• Frequent headaches, which often feel worse in the morning.
• Dizziness or balance problems.
• Nausea and vomiting without a clear stomach bug.
• Vision changes, such as double vision or blurred sight.
• Hearing loss or ringing in the ears.
• Sudden seizures or convulsions.
• Unusual changes in your mood, personality, or temper.
• Memory problems and trouble concentrating.
• Muscle weakness or numbness in your arms or legs.

If you experience any of these persistent neurological symptoms, you should schedule an appointment with a doctor right away to get checked.

What Causes a Meningioma?

Medical researchers do not yet know the exact trigger for every meningioma. However, studies show that roughly 40% to 80% of meningiomas involve an abnormality on chromosome 22. This specific chromosome normally helps control how cells grow and divide. This genetic change usually happens randomly by chance during your lifetime, though it can sometimes run in families.

How Do Doctors Diagnose a Meningioma?

Finding a meningioma can sometimes take time because early symptoms mimic normal signs of aging or everyday stress. If your doctor suspects an issue, they will likely refer you to a neurologist for specialized testing.

Your doctor will perform a thorough physical and neurological exam to check your reflexes, balance, and senses. They will also order advanced imaging scans to look inside your head:

• Brain MRI Scan: This is the best imaging test for finding a meningioma. During the scan, a technician injects a safe contrast dye into a vein in your arm to make blood vessels and tissue details stand out clearly on the computer screen.
• CT Scan: If you cannot have an MRI, your doctor may use a CT scan with contrast dye. This test uses X-rays to create detailed cross-sectional pictures of your skull and brain structures.

In some cases, doctors need to perform a biopsy, where a neurosurgeon takes a tiny tissue sample to examine under a microscope. This confirms the exact type of growth and its grade.

What Are the Treatment Options for Meningioma?

Your treatment plan will depend on your age, overall health, the size of the tumor, and where it sits inside your skull. Doctors often combine different approaches to give you the best outcome:

• Observation or the "wait and see" approach .
• Surgical removal .
• Radiation therapy .
• Palliative care for symptom relief .
• Chemotherapy in rare instances .

Observation (The "Wait and See" Approach).

Doctors often choose to monitor small, slow-growing meningiomas without immediate surgery if you have no symptoms or very mild signs. Regular follow-up appointments and repeat MRI scans ensure the growth is not changing.

Surgery.

For tumors causing noticeable symptoms or growing rapidly, surgical removal is the primary treatment. Removing the entire tumor successfully cures a large majority of patients. However, surgery depends heavily on whether the tumor sits near critical blood vessels or deep brain structures.

Radiation Therapy.

Radiation therapy uses high-energy beams to destroy remaining tumor cells or stop their growth. Doctors use techniques like stereotactic radiosurgery (SRS) to deliver precise radiation doses to hard-to-reach tumors without harming healthy brain tissue nearby.

Palliative Care.

Palliative care focuses entirely on relieving symptoms, reducing pain, and improving your daily quality of life alongside your main medical treatments.

Chemotherapy.

Chemotherapy uses strong medicines to fight abnormal cells. While rarely used for standard meningiomas, doctors may consider specialized drugs like bevacizumab for aggressive or recurring tumors that do not respond to surgery or radiation.

What Are the Side Effects and Complications of Treatment?

Every medical treatment carries potential side effects that you should discuss thoroughly with your medical team before starting care.

Potential Surgical Risks.

Brain surgery is a major medical procedure. Risks include infection, bleeding, and brain swelling. Depending on where the tumor was located, surgery can sometimes affect cranial nerves, impacting your vision, facial movements, or swallowing ability.

Radiation Side Effects.

Radiation therapy is painless, but it can cause temporary skin irritation, hair loss in the treated area, fatigue, headaches, and mild nausea. Most of these side effects fade within a few weeks after treatment ends.

What Risk Factors Increase Meningioma Chances?

Doctors have identified several factors that raise your chances of developing a meningioma:

• Advancing Age: Your risk increases greatly after age 65.
• Gender: Women face a higher risk than men due to hormonal influences and estrogen exposure.
• Radiation Exposure: Previous radiation therapy to the head increases long-term risk.
• Genetic Syndromes: Rare inherited conditions like Neurofibromatosis Type 2 (NF2) raise your chances of developing multiple meningiomas.

What is the Long-Term Outlook (Prognosis)?

Your personal outlook depends heavily on your age, overall health, tumor grade, and how completely surgeons can remove the growth. Grade I tumors have a 5-year survival rate of over 95%. This higher grades carry lower survival percentages. Your doctor is the best person to give you precise prognostic information tailored to your unique test results.

Questions to Ask Your Doctor.

• What exact grade and type of meningioma do I have?
• Is surgery necessary right now, or can we safely observe it?
• What are the specific risks of my recommended treatment plan?
• How often will I need follow-up MRI scans?

Sources & References:

• Mayo Clinic. (2025). Meningioma: Symptoms and Causes. Retrieved from Mayo Clinic medical guides.
• Cleveland Clinic. (2024). Meningioma Brain Tumors: Diagnosis and Treatment. Retrieved from Cleveland Clinic health library.
• National Health Service (NHS UK). (2025). Meningioma Overview. Retrieved from NHS health information portal.
• Centers for Disease Control and Prevention (CDC). (2025). Brain and Other Nervous System Tumors Statistics.
• National Institutes of Health (NIH / PubMed Central). Meningioma how it happens and Clinical Management Guidelines.