Malignant Meningiomas

This small group encompasses the atypical and clear-cell grade 2, and the anaplastic and papillary grade 3

meningiomas. They all display increased cellularity, mitoses, and pleomorphism. Grade 3 meningiomas are prone to invade the brain, recur, seed via CSF, and metastasize to bones, lungs, and liver.

Clear-cell meningioma contains cells with clear cytoplasm containing glycogen.

In papillary meningioma, the cells and their processes are arranged around blood vessels in a papillary pattern.

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