meningioma

DEFINITION of meningioma

Meningioma is a primary central nervous system tumor that originates from the meninges, the three-layered membranes (dura mater, arachnoid, pia mater) that surround and protect the brain and spinal cord, most commonly arising from arachnoid cap cells. It is the most common primary brain tumor in adults and is usually benign (WHO grade I), though atypical (grade II) and malignant (grade III) meningiomas can occur and are associated with higher recurrence and more aggressive behavior. Meningiomas do not begin in brain parenchyma but gain a “brain tumor” classification because their intracranial or intraspinal location allows them to compress or displace nearby neural tissue, cranial nerves, or blood vessels, producing focal neurologic deficits, seizures, or symptoms of increased intracranial pressure. Clinically relevant subtypes include cerebral (intracranial) meningioma (D32.0), spinal meningioma (D32.1), and meningioma of unspecified site (D32.9), which differ by anatomic location but share a common meningeal origin and similar histologic patterns. meningioma is often distinguished from other CNS neoplasms such as glioma (originating from glial cells within brain parenchyma) and schwannoma (arising from Schwann cells of peripheral or cranial nerves) by its dural-based attachment, extra-axial location, and characteristic imaging features such as a “dural tail.”

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ETYMOLOGY of meningioma

greek | latin

Component	Origin	Meaning
mening-	Greek mēnínges (meh-NEEN-gess)	“membranes,” “meninges” — the protective coverings surrounding the brain and spinal cord
meningi-	Derived combining form from Greek mēnínges	”pertaining to the meninges” — used to form terms related to meningeal structures or pathology
-oma	Greek -ôma (OH-ma)	Noun-forming suffix — “tumor,” “mass,” or “swelling”

The word entered modern medical English in the early 20th century as meningioma (noun), built from the combining form meningi- (“relating to the meninges”) and the tumor suffix -oma (“tumor, mass, swelling”), literally “tumor of the meninges.” The term reflects the extra-axial origin of these lesions in the meningeal membranes rather than in brain parenchyma, distinguishing them from intraparenchymal tumors such as glioma and astrocytoma. The root family around mening- connects meningitis (inflammation of the meninges), meningoencephalitis (combined meningeal and brain inflammation), and meningocele (herniation of meninges through a bony defect), all emphasizing the central role of the meninges in CNS disease. The suffix -oma is highly productive in oncology and neuropathology, appearing in terms such as glioma, schwannoma, and hematoma, each denoting a mass or collection but differing by tissue of origin.

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🔀 ALIASES / ALTERNATE TERMS

• Meningeal (adjective form — common collocations include “meningeal tumor,” “meningeal mass,” and “meningeal enhancement” on imaging reports)
• Benign meningioma (lay and clinical term; often used in neuro-oncology and neurosurgery to distinguish WHO grade I lesions from atypical or malignant variants)
• Meningeal neoplasm (partial/lesser form describing the broader category of tumors arising from meninges; meningioma is the most common representative of this group)
• Dural-based mass (clinical descriptor synonym used in radiology reports, frequently corresponding to a meningioma and typically coded under D32.0 or D32.9 depending on documented site)
• Cerebral meningioma (related clinical entity describing a meningioma attached to the cerebral meninges; coded as D32.0 when site is intracranial/brain coverings)
• Spinal meningioma (systemic or syndromic form arising from spinal meninges; coded as D32.1 when location is spinal cord coverings and often associated with focal myelopathy or radiculopathy)
• Skull base meningioma (etiologic/anatomic subtype arising near the skull base, often involving cranial nerves and major vessels; coded under D32.0 when cerebral meninges are involved)
• Parasagittal/falcine meningioma (etiologic/anatomic subtype defined by location along the sagittal sinus or falx cerebri; typically coded with D32.0 and described by precise neurosurgical localization)
• Convexity meningioma (anatomic subtype on the outer brain surface beneath the skull, arising from cerebral meninges; coded as D32.0 and often amenable to surgical resection)
• Posterior fossa meningioma (anatomic subtype located in the posterior cranial fossa; classified with D32.0 for cerebral meninges or with spinal codes when extending to spinal meninges)
• Malignant meningioma (anatomic/pathologic subtype describing WHO grade II-III lesions with more aggressive behavior and higher recurrence; coded under appropriate malignant neoplasm codes rather than D32.0/D32.9, but still rooted in meningeal origin)

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🔗 RELATED TERMS

• glioma — the opposite in terms of tissue origin compared to meningioma; a group of tumors arising from glial cells within brain parenchyma rather than meninges, distinguished by intra-axial location, different imaging patterns, and separate ICD-10-CM codes in malignant or benign neoplasm categories.
• schwannoma — same-root sibling in the sense of being a benign nerve sheath tumor; arises from Schwann cells of peripheral or cranial nerves, often presenting as extra-axial masses near the skull base, but coded under nerve sheath neoplasm codes rather than meningeal neoplasm codes.
• meningitis — closely related clinical entity involving inflammation of the meninges rather than neoplastic proliferation; typically presents with headache, neck stiffness, fever, and meningeal signs and is coded under infectious/inflammatory codes.
• meningoencephalitis — complex syndrome with combined inflammation of meninges and brain parenchyma, overlapping anatomically with meningioma in the meningeal compartment but differing fundamentally in pathophysiology and treatment.
• Dural metastasis — mechanism-related term for secondary malignant deposits in the meninges from systemic cancers; can mimic meningioma radiographically but is coded as metastatic malignancy rather than benign neoplasm of meninges.
• Hyperostosis of skull — adjective mechanism term describing thickening of adjacent skull bone; commonly seen with long-standing meningiomas and serves as a radiologic clue to meningeal origin.
• Cerebral edema — cellular mechanism term for swelling in brain parenchyma adjacent to meningiomas due to disruption of the blood-brain barrier, contributing to symptoms and influencing surgical planning.
• Benign neoplasm of cerebral meninges (D32.0) — disease entity using this term; represents meningioma when the site is documented as cerebral meninges (brain coverings) and is the most specific intracranial meningioma code.
• Benign neoplasm of spinal meninges (D32.1) — disease entity capturing spinal meningioma; used when documentation specifies spinal cord coverings as the site of the meningeal tumor.
• Benign neoplasm of meninges, unspecified (D32.9) — disease entity used when imaging or clinical documentation confirms a meningioma but does not specify whether the site is cerebral or spinal meninges; serves as a catch-all for unspecified meningeal benign neoplasms.
• Craniotomy for meningioma resection (61512) — diagnostic/therapeutic procedure associated with this term; open skull surgery to excise a supratentorial meningioma, typically combined with adjunct codes for navigation (61781) and operating microscope (69990).

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CODING CORNER

🏥 ICD-10-CM CODES

Benign Neoplasm of Meninges (Meningioma — Site-Specific Coding)

Code	Description
D32.9	Benign neoplasm of meninges, unspecified — used when a meningioma is confirmed but documentation does not specify cerebral vs. spinal meninges.
D32.0	Benign neoplasm of cerebral meninges — meningioma arising from brain coverings; most common code for intracranial meningioma when site is documented.
D32.1	Benign neoplasm of spinal meninges — spinal meningioma arising from meninges surrounding the spinal cord.

Intracranial vs. Spinal Site Detail (When Documentation Allows)

Code	Description
D32.0	Use for skull base, convexity, parasagittal, falcine, and other intracranial meningiomas when clearly documented as cerebral meninges.
D32.1	Use for intradural extramedullary meningiomas and other spinal meningeal tumors documented at the level of the spinal cord coverings.

Unspecified Site (When Location Is Not Documented)

Code	Description
D32.9	Appropriate when imaging or pathology confirms a benign meningioma but documentation fails to specify cerebral vs. spinal meninges, or when site detail is clinically irrelevant to the encounter.

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🔧 COMMON CPT CODES (Meningioma-Related Diagnosis & Treatment)

CPT Code	Description
61512	Craniectomy, trephination, or bone flap craniotomy; for excision of meningioma, supratentorial — primary open neurosurgical procedure for resection of supratentorial meningioma.
61510	Craniectomy, trephination, or bone flap craniotomy; for excision of brain tumor, supratentorial, except meningioma — used when the supratentorial mass is a non-meningioma brain tumor rather than a meningeal lesion.
61518	Craniectomy or craniotomy for excision of brain tumor, infratentorial — used for posterior fossa/infratentorial tumors; some skull base meningiomas may be approached with this code depending on site and documentation.
61781	Stereotactic computer-assisted (navigational) procedure; cranial, intradural — add-on code for computer-assisted navigation used during craniotomy for meningioma resection.
69990	Microsurgical techniques, requiring use of operating microscope (list separately in addition to code for primary procedure) — add-on code for operating microscope routinely used in skull base or complex meningioma resections.
70551	MRI of brain without contrast — diagnostic imaging study often used to identify and follow meningiomas; linked to appropriate meningioma diagnosis codes.
70552	MRI of brain with contrast — contrast-enhanced MRI that better delineates meningioma margins, dural attachment, and associated edema.
70553	MRI of brain without and with contrast — comprehensive MRI protocol frequently used in preoperative planning and surveillance of meningioma.
61624	Transcatheter permanent occlusion or embolization, intracranial vessels — endovascular embolization of tumor-feeding vessels, sometimes performed preoperatively for highly vascular meningiomas.
61796	Stereotactic radiosurgery (SRS), cranial lesion(s); simple lesion, up to 5 isocenters — used for radiosurgical treatment of selected small or residual meningiomas.
61798	Stereotactic radiosurgery (SRS), cranial lesion(s); complex lesion, more than 5 isocenters — used for more complex radiosurgical plans for meningiomas with irregular or skull-base geometry.

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⚠️ Coding Note: For inpatient profee encounters involving meningioma, site specificity drives ICD-10-CM selection: use D32.0 when documentation clearly identifies an intracranial meningioma involving cerebral meninges, D32.1 for spinal meningioma of spinal meninges, and D32.9 when the meningeal site is unspecified or not documented. Code the meningioma diagnosis before procedure codes such as 61512 (craniotomy for excision of supratentorial meningioma), and add staging, histologic grade, or malignant neoplasm codes if pathology confirms atypical or malignant transformation rather than purely benign disease. Watch for undercoding when radiology or operative notes describe a “dural-based mass,” “extra-axial lesion consistent with meningioma,” or “skull base meningioma” without a corresponding D32.x code; these phrases should prompt assignment of the appropriate benign neoplasm of meninges code and may justify a query if location (cerebral vs. spinal) is not specified. Payer and authorization workflows often require precise site and histologic detail (for example, skull base vs. convexity, WHO grade, residual or recurrent status) to support high-cost procedures such as 61512 with 61781 and 69990, stereotactic radiosurgery (61796/61798), or preoperative embolization (61624); ensure documentation captures these specifics and sequence meningioma codes ahead of symptom codes like headache or seizures.

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DERIVATIONS of meningioma

TABLE definition AS Definition
FROM #medterm 
WHERE length(filter(roots, (word) => econtains([[meningioma]].roots, word))) > 0 AND file.name != [[meningioma]].file.name
SORT file.name ASC

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Query functionality

TABLE definition AS Definition
FROM #medterm 
WHERE length(filter(definition, (word) => econtains([[meningioma]].definition, word))) > 0 AND file.name != [[meningioma]].file.name

Med terms dictionary Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms