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Most meningiomas are benign, but a smaller number are atypical (Grade 2) or malignant (Grade 3). The grade — not the size — is what really shapes your outlook and plan.
If your report mentions a meningioma "grade", here is the plain version. A meningioma grows from the meninges — the protective membranes around the brain and spinal cord — not from brain cells themselves. The World Health Organization (WHO) sorts every meningioma into one of three grades based on how the cells look under a microscope and how they behave: Grade 1 (benign), Grade 2 (atypical), and Grade 3 (anaplastic or malignant).
The reassuring news first: most meningiomas are benign. The grade — not the size — is the strongest guide to how the tumour will behave and how closely it needs watching. This page focuses on the higher grades: what an atypical meningioma is, when a meningioma becomes malignant, and what each grade changes. For the full picture of symptoms and care, see our meningioma overview and the wider brain cancer & tumour hub.
Meningiomas are graded 1 to 3, not 1 to 4 like gliomas. According to the 2021 WHO Classification of Tumours of the Central Nervous System (WHO CNS5) and EANO guidance, roughly 80% of meningiomas are benign Grade 1, about 15-20% are atypical Grade 2, and only around 1-3% are malignant Grade 3. So while a higher grade is more serious, it is also the minority — and the grade can only be confirmed by examining tissue under a microscope, not from a scan alone.
This table summarises how the three WHO grades differ. Remember that where the tumour sits and how completely it can be removed matter alongside the grade — two tumours of the same grade can still need different plans.
| Grade | Name & Behaviour | Roughly how common | Recurrence Risk | Usual Approach |
|---|---|---|---|---|
| 1Grade 1 | Benign — slow-growing, well-defined, does not invade brain tissue | ~80% | Low after complete removal | Monitoring or surgery (coordinated with neurosurgical partners) |
| 2Grade 2 | Atypical — grows faster, may invade nearby brain, sits between benign and malignant | ~15–20% | Moderate; recurs more often | Surgery, often followed by radiation therapy; closer MRI follow-up |
| 3Grade 3 | Anaplastic / malignant — fast-growing, behaves like a true cancer | ~1–3% | High | Surgery plus radiation; intensive, cancer-style follow-up |
Adapted from the 2021 WHO Classification of CNS Tumours, NCCN Central Nervous System Cancers guidelines, and EANO meningioma guidance. The "usual approach" varies for every patient — your plan is decided by a multidisciplinary tumour board.
A grade is a guide, not a verdict. Here is what each one typically means — though location, your symptoms, and how much can be safely removed all shape the real picture.
The most common meningioma. Grade 1 tumours grow slowly, have clear borders, and do not invade brain tissue. Many small, symptom-free ones are simply watched with regular MRI. When treatment is needed, complete removal often gives an excellent long-term outlook with a low chance of return.
An atypical meningioma grows faster than Grade 1 and may push into nearby brain tissue. It is not a true cancer like Grade 3, but it recurs more often, so it is taken more seriously — usually surgery, frequently followed by radiation, and closer follow-up. This is the grade most patients searching for "what does atypical mean" are trying to understand.
A malignant (anaplastic) meningioma is rare but behaves like a genuine cancer — fast-growing with a high chance of recurrence. Treatment is the most intensive: surgery plus radiation therapy and close, cancer-style monitoring. Because it is uncommon, care follows NCCN and EANO guidance through a full tumour board.
Wondering how the grade translates into treatment? See our dedicated meningioma treatment page.
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An "atypical" or higher-grade result can be frightening when no one explains it. Our neuro-oncology team walks you through exactly what your grade means and what comes next — across 35+ centres.
A grade is not guessed from a scan. While MRI can suggest a more aggressive tumour — for example, irregular edges, swelling in the surrounding brain, or rapid growth between scans — the final WHO grade comes from examining tumour tissue. For meningiomas, that tissue is usually obtained during surgery rather than a separate biopsy, because most have a typical appearance on MRI. The diagnostic path generally has three steps:
To grade a meningioma, the neuropathologist looks for specific features: how quickly the cells are dividing (the mitotic count), whether the tumour has invaded nearby brain tissue, areas of dead tissue (necrosis), and disorganised, sheet-like growth. A higher mitotic count or brain invasion pushes a tumour from Grade 1 up to Grade 2 (atypical); the most aggressive features define Grade 3 (malignant).
Here is an important update many patients have never heard. Since the 2021 WHO classification, molecular markers can change a meningioma's grade — not just how the cells look. Two tumours that appear similar under the microscope can now be graded differently based on their genetics. CION can arrange these tests where they may change the plan.
A homozygous deletion of the CDKN2A/B genes is now enough on its own to classify a meningioma as Grade 3 (malignant), even when the cells might otherwise look lower grade. It is one of the strongest single molecular markers in meningioma and can shift both the grade and how intensively the tumour is treated.
A TERT promoter mutation is also recognised by the WHO as a feature that can raise a meningioma to Grade 3, because it is linked to faster growth and a higher chance of recurrence. Like CDKN2A/B, it shows why grading is no longer based on appearance alone.
Bring your report and MRI to a specialist who can read the molecular section. Book a free consultation or call 18002028726 to have your grade and any markers explained clearly. For a wider look at how grading works across all brain tumours, see WHO brain tumour grades.
Your grade, together with the tumour's location and how completely it can be removed, shapes the whole plan. CION delivers radiation therapy (IMRT/IGRT), imaging and diagnosis, molecular testing, and supportive care directly, and coordinates all neurosurgery and stereotactic radiosurgery with accredited specialist partners.
We follow NCCN and EANO guidelines for grading and treatment, and explain every step in plain language during your 45-minute consultation. See the dedicated meningioma treatment page for more depth, or the brain tumour treatment in Hyderabad overview.
A meningioma's grade is the strongest single predictor of whether it will return. Per EANO and NCCN guidance, Grade 2 (atypical) and Grade 3 (malignant) meningiomas recur far more often than benign Grade 1 tumours — which is why higher grades usually have radiation therapy after surgery and need long-term follow-up MRI scans. Outcome figures are reported as ranges across large groups, not predictions for any one person, and your team should share them honestly, never as a guarantee.
A grade carries real weight — especially when it is "atypical" or higher — so it is reasonable, and often wise, to confirm it. A second opinion is especially valuable if:
CION offers a free written second opinion. Our team can re-read the pathology, arrange any missing molecular tests, and explain exactly what your grade means. We walk this journey with you. Request your free second opinion today, or call 18002028726.
Get a free written second opinion from CION's tumour board — especially valuable for an atypical or malignant meningioma, or if molecular testing such as CDKN2A/B hasn't been arranged yet.
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Start Your Story. Book Free Consultation.An atypical meningioma is a WHO Grade 2 meningioma — the middle ground between a benign Grade 1 tumour and a malignant Grade 3 one. Under the microscope its cells divide more actively, and it may show features such as brain invasion or a higher mitotic count. Atypical meningiomas grow faster than Grade 1 tumours and are more likely to come back after treatment, so they usually need closer follow-up and sometimes radiation therapy after surgery. They are not "cancer" in the way an aggressive Grade 3 tumour is, but they do behave more assertively than the common benign meningioma. The grade is confirmed only by a neuropathologist examining tissue under a microscope.
The World Health Organization (WHO) sorts meningiomas into three grades by how the cells look and behave. Grade 1 (benign) tumours — about 80% of meningiomas — grow slowly and rarely return after complete removal. Grade 2 (atypical) tumours grow faster, may invade nearby brain tissue, and recur more often. Grade 3 (anaplastic or malignant) tumours are rare, grow quickly, and behave like a true cancer with a high chance of recurrence. The grade — not the size — is the strongest guide to how the tumour will behave and what treatment you may need.
A Grade 2 (atypical) meningioma sits between benign and malignant. It is not classed as a true cancer the way a Grade 3 (malignant) meningioma is, but it does not behave like a harmless benign tumour either. It grows more quickly than a Grade 1 meningioma and is much more likely to recur, which is why doctors treat it more seriously — often with surgery followed by radiation and long-term MRI surveillance. So the honest answer is "in between": more concerning than a benign tumour, but not the aggressive cancer that a malignant meningioma represents. Your neuro-oncology team will explain exactly what your grade means for your plan.
Most meningiomas are benign. According to published series and EANO guidance, roughly 80% are WHO Grade 1, around 15–20% are Grade 2 (atypical), and only about 1–3% are Grade 3 (malignant/anaplastic). So while higher-grade meningiomas exist, they are the minority. The reason grade matters so much is that this small group accounts for most of the recurrences and the more intensive treatment. The only way to know your grade for certain is for a neuropathologist to examine tissue removed at surgery — imaging alone can suggest a higher grade but cannot confirm it.
They can, and the chance is closely tied to the grade and how completely the tumour was removed. A fully removed Grade 1 meningioma has a low recurrence rate. Grade 2 (atypical) tumours recur more often, and Grade 3 (malignant) tumours have the highest recurrence risk of all. That is why higher-grade meningiomas usually have radiation therapy after surgery and need long-term follow-up MRI scans to catch any return early. If a meningioma does recur, it can often be treated again with further surgery or stereotactic radiosurgery, coordinated with specialist partners. See our meningioma overview for the full picture.
The grade is decided by a neuropathologist who examines tumour tissue under a microscope after it is removed during surgery. They count how quickly the cells are dividing (the mitotic rate), look for whether the tumour has invaded nearby brain tissue, and check for specific aggressive features. Since the 2021 WHO classification, certain molecular markers — such as a CDKN2A/B deletion or a TERT promoter mutation — can also raise a meningioma to Grade 3 even when the cells alone might look lower grade. This is why a tissue diagnosis, not just an MRI, is essential for an accurate grade and the right treatment plan.
Yes — grade is one of the strongest factors. Most Grade 1 meningiomas are managed with monitoring or surgery alone and have an excellent long-term outlook. Grade 2 (atypical) tumours usually need surgery plus radiation and closer follow-up. Grade 3 (malignant) meningiomas need the most intensive, cancer-style treatment. Published outcome figures from sources such as NCCN and EANO are ranges across many patients, not predictions for any one person, and we share them honestly and sensitively — never as a guarantee. For coordinated, guideline-based care, see brain tumour treatment in Hyderabad.
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