Meningioma: Why Your Brain Has a Growth & Medically Approved Next Steps

Hearing that you or someone you love may have a meningioma can feel overwhelming. The word "tumor" naturally raises concern. The good news is that most meningiomas are benign (non-cancerous) and often grow slowly. Still, they can cause symptoms and sometimes require treatment.

Let's walk through what a meningioma is, why it develops, what symptoms to watch for, and the medically approved next steps—based on trusted neurological and oncological guidelines.

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What Is a Meningioma?

A meningioma is a tumor that develops from the meninges, the protective layers of tissue that surround your brain and spinal cord. It does not start in the brain itself. Instead, it grows from the membranes covering the brain.

Key facts:

• Meningiomas are the most common primary brain tumor in adults.
• About 80–90% are benign (Grade I).
• A smaller number are atypical (Grade II) or malignant (Grade III).
• They are more common in women, especially after age 40.

Because they often grow slowly, many meningiomas are discovered incidentally during imaging for another reason.

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Why Does a Meningioma Develop?

In most cases, the exact cause of a meningioma is not fully understood. However, several medically recognized risk factors are linked to their development:

1. Genetic Changes

Changes in certain genes (especially the NF2 gene) are associated with meningioma formation. People with Neurofibromatosis type 2 (NF2) have a higher risk.

2. Radiation Exposure

Prior radiation therapy to the head—particularly during childhood—significantly increases risk.

3. Hormonal Factors

Meningiomas are more common in women and may grow faster during:

• Pregnancy
• Hormone replacement therapy
• Breast cancer treatment involving hormones

This suggests a possible link to estrogen and progesterone receptors.

4. Age

The risk increases with age, particularly after 40.

Importantly, most people who develop a meningioma have no clear cause. It is not something you did wrong.

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Symptoms of Meningioma

Symptoms depend on the tumor's size and location. Some people have no symptoms at all.

When symptoms do occur, they may include:

• Persistent or worsening headaches
• Seizures
• Vision changes (double vision, blurred vision)
• Hearing loss or ringing in one ear
• Memory problems
• Weakness in arms or legs
• Personality or behavior changes
• Numbness in the face

Because meningiomas grow slowly, symptoms often develop gradually.

If you're experiencing any of these symptoms and want to better understand what might be causing them, Ubie's free AI-powered Benign Tumor of the Nervous System symptom checker can help you assess your situation in just a few minutes and prepare informed questions before your doctor visit.

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How Is a Meningioma Diagnosed?

Doctors typically diagnose a meningioma through imaging studies.

Common Diagnostic Tools

• MRI (Magnetic Resonance Imaging) – The gold standard for detecting meningiomas.
• CT scan – Sometimes used if MRI is unavailable.
• Biopsy – Performed if surgery occurs or if tumor grade needs confirmation.

After imaging, doctors classify the tumor by grade:

• Grade I (Benign) – Slow growing, least aggressive
• Grade II (Atypical) – Higher recurrence risk
• Grade III (Malignant) – Rare but more aggressive

Knowing the grade helps guide treatment decisions.

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Medically Approved Next Steps

Treatment depends on several factors:

• Tumor size
• Growth rate
• Location
• Symptoms
• Patient age and overall health

Here are the standard approaches used in neurology and oncology.

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1. Watchful Waiting (Active Surveillance)

If the meningioma is:

• Small
• Not causing symptoms
• Growing very slowly

Your doctor may recommend monitoring with regular MRIs (every 6–12 months at first).

This approach avoids unnecessary surgery while ensuring the tumor does not grow significantly.

Many people live for years with a stable meningioma that never requires treatment.

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2. Surgery

Surgery is the primary treatment when:

• The tumor is causing symptoms
• It is large
• It shows signs of growth
• It is pressing on critical brain structures

The goal is complete removal, but this depends on location. Tumors near vital nerves or blood vessels may not be fully removable.

Risks vary based on tumor position but may include:

• Neurological deficits
• Infection
• Bleeding
• Seizures

For most Grade I meningiomas that are fully removed, surgery can be curative.

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3. Radiation Therapy

Radiation may be recommended:

• After incomplete surgical removal
• For inoperable tumors
• For recurrent tumors
• For Grade II or III meningiomas

Types include:

• Stereotactic radiosurgery (SRS) – Highly focused radiation in one or few sessions
• Fractionated radiation therapy – Lower doses over multiple sessions

Radiation can effectively control growth, particularly in smaller tumors.

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4. Treatment for Malignant Meningioma

Malignant (Grade III) meningiomas are rare but require:

• Aggressive surgery when possible
• Radiation therapy
• Close monitoring

Chemotherapy is not commonly effective but may be considered in select cases.

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What Is the Prognosis?

For most people, the outlook is reassuring:

• Grade I meningiomas have excellent long-term survival.
• Recurrence rates depend on grade and completeness of removal.
• Many patients live normal lives after treatment.

However, atypical and malignant forms require closer follow-up due to higher recurrence risk.

Regular imaging follow-up is critical—even after successful treatment.

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When to Seek Immediate Medical Attention

Call emergency services or seek urgent care if you experience:

• Sudden severe headache
• New seizures
• Sudden weakness or paralysis
• Vision loss
• Confusion or personality changes that are abrupt

These could signal increased pressure in the brain or bleeding.

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Living With a Meningioma

If you've been diagnosed, practical steps include:

• Keep all imaging appointments
• Maintain open communication with your neurologist or neurosurgeon
• Ask about tumor grade and growth rate
• Discuss hormonal medications with your doctor
• Manage seizures with prescribed medications if needed

It can also help to:

• Track symptoms in a journal
• Bring a support person to appointments
• Ask for a clear follow-up plan

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Common Questions

Is a meningioma brain cancer?

Most are not cancer. About 80–90% are benign.

Can stress cause a meningioma?

No credible evidence links stress to meningioma formation.

Can meningiomas shrink on their own?

Rarely. Most either remain stable or grow slowly.

Is surgery always necessary?

No. Many small, symptom-free meningiomas are safely monitored.

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The Bottom Line

A meningioma is a tumor that develops from the protective layers around the brain. Most are benign and slow-growing. While the diagnosis can sound alarming, many cases require only monitoring, and when treatment is needed, outcomes are often very good.

Still, every brain tumor deserves careful evaluation. If you notice persistent neurological symptoms—or have already been diagnosed—your next step should be to speak to a doctor, preferably a neurologist or neurosurgeon. Anything affecting the brain has the potential to become serious, and timely evaluation matters.

If you'd like to quickly assess your symptoms and understand whether they could be related to a Benign Tumor of the Nervous System, Ubie's free AI-powered symptom checker can help you organize your concerns and generate meaningful questions to discuss with your healthcare provider at your next appointment.

You don't need to panic—but you do need accurate information, proper imaging, and professional guidance. With the right care plan, most people with a meningioma go on to live full, meaningful lives.