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Table 1 Classification of meningiomas

From: Mast cells in meningiomas and brain inflammation

1.   Grade I. Meningothelial, fibrous (fibroblastic), transitional (mixed),   psammomatous, angiomatous, microcystic, secretory,   lymphoplasmacyte-rich, metaplastic
2.   Grade II. Chordoid, clear cell, atypical, brain-invasive
3.   Grade III. Papillary, rhabdoid, and anaplastic (malignant)
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