Malignant meningioma is a rare, fast-growing tumor that forms in one of the inner layers of the meninges (thin layers of tissue that cover and protect the brain and spinal cord). Malignant meningioma often spreads to other areas of the body.
The World Health Organization classification system defines both grade II and grade III meningiomas as malignant. Historically, histological subtypes have also been used in classification including:
- clear cell (WHO grade II),
- chordoid (WHO grade II),
- rhabdoid (WHO grade III), and
- papillary (WHO grade III)
Benign or low grade meningiomas (WHO grade I) include meningothelial, fibrous, transitional, psammomatous, angiomatous, microcystic, secretory, lymphoplasmacyte-rich, and metaplastic.
- Malignant meningioma entry in the public domain NCI Dictionary of Cancer Terms
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malignant meningioma — A rare, fast growing tumor that forms in one of the inner layers of the meninges (thin layers of tissue that cover and protect the brain and spinal cord). Malignant meningioma often spreads to other areas of the body … English dictionary of cancer terms
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Meningioma — A type of brain tumor that starts within the meninges. These slow growing tumors are sometimes associated with prior head trauma. * * * A benign, encapsulated neoplasm of arachnoidal origin, occurring most frequently in adults; most frequent form … Medical dictionary
meningioma — n. a benign tumour arising from the fibrous coverings of the brain and spinal cord (meninges). It is usually slow growing and produces symptoms by pressure on the underlying nervous tissue. In the brain the tumour may cause focal epilepsy and… … The new mediacal dictionary
meningioma — noun a tumor arising in the meninges which surround the brain and spinal cord; usually slow growing and sometimes malignant • Hypernyms: ↑tumor, ↑tumour, ↑neoplasm … Useful english dictionary
chordoid meningioma — a rare, moderately malignant type of meningioma characterized histologically by cells in lobules and chains resembling those of a chordoma … Medical dictionary
clear cell meningioma — a rare, moderately malignant type of meningioma characterized histologically by clear cells … Medical dictionary
papillary meningioma — a rare, malignant type of meningioma characterized by cells in a papillary configuration, often with necrosis or cyst formation … Medical dictionary
rhabdoid meningioma — a rare, malignant type of meningioma characterized histologically by rhabdoid cells with eccentric nuclei; these are most often seen as recurrences of formerly benign meningiomas … Medical dictionary