WHO 2000 Classification of Meningiomas:
WHO Grade 1
Meningiothelial meningioma
Fibrous (fibroblastic) meningioma
Transitional (mixed) meningioma
Psammomatous meningioma
Angiomatous meningioma
Microcystic meningioma
Secretory meningioma
Lymphoplasmacyte-rich meningioma
Metaplastic meningioma
WHO Grade 2
Chordoid meningioma
Clear Cell meningioma
Atypical meningioma
WHO Grade 3
Papillary meningioma
Rhabdoid meningioma
Anaplastic meningioma
Of these subtypes, meningiothelial, fibrous and transitional are the most common. Most of these subtypes behave similarly, however anaplastics are the most aggressive.
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