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Neurosurgery›Condition·Updated Apr 18, 2026·v1

Meningioma

Meningioma is the most common primary CNS tumor, typically benign but capable of aggressive behavior. Diagnosis is primarily radiological (MRI) and molecular (NF2, TERT). Management involves observation for stable, asymptomatic cases, and surgery or radiation for symptomatic or high-grade lesions.

High Evidence278 references·1,143 words·5 min read·v1
meningiomaneurosurgerybrain tumorWHO GradeNF2radiosurgery

Quick Reference

RxDrug of choiceBevacizumab 10 mg/kg IV every 2 weeks (for refractory high-grade disease/edema)
AltAlternatives177Lu-DOTATATE (PRRT), Everolimus, Somatostatin analogs
⊘AvoidRoutine long-term prophylactic anti-seizure medications in seizure-naive patients
DxTest of choiceMRI Brain with and without Gadolinium
ScKey scoreSimpson Grading System (Extent of Resection)
→When to referSymptomatic mass effect, rapid growth on serial imaging, or WHO Grade 2/3 pathology
Meningiomas are mostly benign but require long-term monitoring; management shifts from observation to surgery or radiation based on symptoms, growth, and molecular grade.
Meningiomas are the most common primary central nervous system (CNS) neoplasms, originating from the arachnoid cap cells of the leptomeninges. While approximately 80-85% are benign (WHO Grade 1), they can cause significant morbidity through mass effect on adjacent neurovascular structures. The clinical course is highly variable, ranging from incidental findings that remain stable for decades to aggressive, malignant variants (WHO Grade 3) with high recurrence rates.

Overview and Recommendations

Background

  • •Recognize meningiomas as the most prevalent primary intracranial tumor, representing nearly 40% of all CNS neoplasms. They arise from the arachnoid cap cells and are most frequently diagnosed in the sixth and seventh decades of life, with a median age of 66 years.
  • •Identify the strong female predominance, with women affected at roughly twice the rate of men. This disparity is largely attributed to the expression of estrogen and progesterone receptors within the tumor cells, and risk is further modified by exogenous hormone use, such as high-dose progestins or hormone replacement therapy.
  • •Screen for the most significant environmental risk factor: prior exposure to ionizing radiation. Radiation-induced meningiomas (RIMs) often appear 20–30 years after cranial irradiation for childhood malignancies or tinea capitis and are characterized by more aggressive biological behavior, multifocality, and higher histological grades.
  • •Differentiate between the two primary molecular pathways: NF2-mutated and NF2-wildtype. Approximately 50-60% of sporadic cases involve inactivation of the NF2 gene on chromosome 22q, leading to the loss of the tumor suppressor Merlin, while non-NF2 variants often harbor mutations in TRAF7, AKT1, KLF4, or SMO.
  • •Assess for genetic predisposition syndromes in patients presenting with multiple meningiomas or at a young age. is the most common, but other rare syndromes include BAP1 tumor predisposition syndrome (linked to aggressive rhabdoid variants) and Rubinstein-Taybi syndrome.

Evaluation

  • •Suspect meningioma in patients presenting with new-onset focal seizures, progressive headaches, or location-specific neurological deficits. Seizures occur in approximately 30% of symptomatic patients and are often associated with peritumoral brain edema (PTBE).
  • •Perform a detailed cranial nerve survey based on tumor location. For olfactory groove lesions, test for anosmia; for spheno-orbital tumors, evaluate for proptosis and visual field defects; and for cerebellopontine angle lesions, assess for hearing loss or facial nerve weakness.
  • •Order a high-resolution MRI with and without gadolinium as the primary diagnostic modality. Look for a well-circumscribed, dural-based mass that is isointense on T1 and T2 sequences and demonstrates robust, homogeneous enhancement with a characteristic "dural tail sign."
  • •Utilize Fluid-Attenuated Inversion Recovery (FLAIR) sequences to quantify peritumoral brain edema. Significant edema often correlates with higher tumor grade, brain invasion, or specific molecular markers like FOXC1 expression.
  • •Obtain a non-contrast CT scan to evaluate for bone involvement. Meningiomas frequently cause reactive hyperostosis (thickening of the adjacent bone) or may contain internal calcifications (psammoma bodies) in 20-25% of cases.
  • •Consider in complex cases or for recurrence monitoring. Because meningiomas nearly universally overexpress somatostatin receptor 2 (SSTR2), this modality is highly sensitive for delineating tumor margins in the skull base or distinguishing tumor from post-radiation changes.
  • •Apply the 2021 WHO Classification criteria to determine tumor grade. Grade 1 is benign (<4 mitoses/10 HPF); Grade 2 is atypical (4-19 mitoses, brain invasion, or specific histology like clear cell/chordoid); and Grade 3 is anaplastic (≥20 mitoses or frank malignancy).
  • •Identify high-risk molecular markers that override histological appearance. The presence of TERT promoter mutations or CDKN2A/B homozygous deletions automatically classifies a tumor as WHO Grade 3, regardless of the mitotic count.
  • •Use immunohistochemistry (IHC) surrogates for molecular testing when NGS is unavailable. Loss of MTAP expression is a reliable surrogate for CDKN2A deletion, and loss of Merlin expression suggests NF2 alteration.
  • •Evaluate the Ki-67 (MIB-1) proliferation index to estimate recurrence risk. While thresholds vary, a Ki-67 index >5-10% is generally associated with more aggressive growth and a higher likelihood of progression after resection.
  • •Rule out mimics of dural-based lesions, such as (SFT), which is distinguished by STAT6 nuclear expression, or primary dural lymphoma, which typically shows restricted diffusion on MRI.
  • •Assess for venous sinus involvement in parasagittal tumors. Use MR venography (MRV) to determine if the superior sagittal sinus is patent, partially compressed, or completely occluded, as this significantly impacts surgical planning and risk.

Management

  • •Adopt a "wait-and-scan" strategy for asymptomatic, incidental WHO Grade 1 meningiomas. Perform a baseline follow-up MRI at 6 months, then annually if stable; for elderly patients with small lesions, observation is often the definitive management.
  • •Pursue maximal safe surgical resection as the primary treatment for symptomatic or growing tumors. The goal is a Simpson Grade I resection (complete removal of tumor, dural attachment, and involved bone) to minimize the risk of recurrence.
  • •Administer perioperative corticosteroids, such as Dexamethasone 4-10 mg every 6 hours, to manage symptomatic peritumoral edema, tapering as soon as clinically feasible postoperatively.
  • •Initiate anti-seizure medications (ASMs) in patients who have experienced a preoperative seizure. Routine prophylactic ASMs in seizure-naive patients are generally not recommended beyond the immediate postoperative week.
  • •Utilize stereotactic radiosurgery (SRS) as primary treatment for small-to-medium (<3 cm or <8 cc) tumors in surgically high-risk areas like the cavernous sinus. A typical margin dose is 14-16 Gy for Grade 1 lesions.
  • •Recommend fractionated radiotherapy (FSRT) for large tumors or those in close proximity to the optic apparatus. Standard dosing is 50.4-54 Gy delivered in 1.8 Gy fractions to minimize the risk of radiation-induced optic neuropathy.
  • •Mandate adjuvant radiotherapy for all WHO Grade 3 (anaplastic) meningiomas and for WHO Grade 2 (atypical) tumors following subtotal resection (STR). Doses for high-grade disease are typically escalated to 60 Gy.
  • •Consider hypofractionated stereotactic radiosurgery (HSRS), such as 25 Gy in 5 fractions, for medium-sized tumors to provide a high biological dose while sparing adjacent healthy tissue and reducing the risk of radiation-induced edema.
  • •Refer patients with treatment-refractory, high-grade meningiomas for systemic therapy. Bevacizumab 10 mg/kg IV every 2 weeks is the most common first-line systemic agent for managing progressive disease and associated edema.
  • •Evaluate candidates for Peptide Receptor Radionuclide Therapy (PRRT) using (Lutathera) 7.4 GBq every 8 weeks for 4 doses if SSTR2 expression is confirmed on PET imaging and standard options are exhausted.
  • •Explore targeted inhibitors for specific mutations: Vismodegib 150 mg daily for SMO mutations, or Capivasertib 400 mg twice daily for AKT1 mutations, ideally within the context of a clinical trial.
  • •Monitor for long-term complications of radiation, including SMART syndrome (stroke-like migraine attacks after radiation therapy) and radiation-induced cognitive decline, which may manifest years after treatment.
  • •Schedule long-term surveillance imaging. For Grade 1 tumors, annual scans for 5 years then biennial; for Grade 2/3, scans every 3-6 months for the first 2-3 years, as recurrences can occur even a decade after initial treatment.
  • •Refer to neuro-ophthalmology for patients with optic nerve sheath meningiomas or tumors involving the orbit to ensure formal visual field and acuity monitoring.
  • •Discharge patients once they are neurologically stable and have adequate seizure control. Ensure they are aware that any new focal deficit or worsening headache requires immediate re-evaluation.

Board Review — High Yield

  • •Dural Tail Sign — Thickening of the adjacent dura mater on MRI, highly characteristic of meningioma.
  • •Psammoma Bodies — Laminated, whorled calcifications seen histologically in transitional and psammomatous subtypes.
  • •NF2 (Merlin) — The most common genetic driver; loss of chromosome 22q is found in ~60% of cases.
  • •SSTR2 — Somatostatin receptor 2, the biological target for 68Ga-DOTATATE PET imaging and PRRT.
  • •Simpson Grade I — Complete resection of tumor, dura, and bone; associated with the lowest recurrence rate.
  • •TERT Promoter Mutation — A molecular marker that defines WHO Grade 3 (malignant) regardless of histology.
  • •Hyperostosis — Reactive bone thickening adjacent to the tumor, often requiring surgical drilling/resection.
  • •Ionizing Radiation — The only well-established environmental risk factor for meningioma development.

Deep Dive — Evidence Details

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