Meningioma classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Haytham Allaham, M.D. [2]

Overview

Meningioma may be classified according to histological criteria of the WHO into 3 groups: benign classic meningioma (WHO grade 1), atypical meningioma (WHO grade 2), and anaplastic malignant meningioma (WHO grade 3). Meningioma may also be classified according to the tumor location into 2 main subtypes: intradural and extradural meningioma.

Classification

• Meningioma may be classified according to WHO histological criteria into 3 groups: benign classic meningioma (WHO grade 1), atypical meningioma (WHO grade 2), and anaplastic malignant meningioma (WHO grade 3).

• The table below lists the subtypes of meningioma according to the WHO grade:

WHO grade	Subtypes
Benign classic meningioma (WHO grade 1)	Meningeothelial, fibroblastic, transitional, psammomatous, angiomatous, microcytsic, secretory, lymphoplasmacyte-rich, metaplastic
Atypical meningioma (WHO grade 2)	Chordoid, clear cell
Anaplastic malignant meningioma (WHO grade 3)	Rhabdoid, papillary

• Meningioma may also be classified according to the tumor location into 2 main subtypes: intradural and extradural meningioma.