Wednesday, August 10, 2011

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.