Definition: A relatively common neoplasm of the CENTRAL NERVOUS SYSTEM that arises from arachnoidal cells. The majority are well differentiated vascular tumors which grow slowly and have a low potential to be invasive, although malignant subtypes occur. Meningiomas have a predilection to arise from the parasagittal region, cerebral convexity, sphenoidal ridge, olfactory groove, and SPINAL CANAL. (From DeVita et al., Cancer: Principles and Practice of Oncology, 5th ed, pp2056-7)
benign or malignant; coord IM with MENINGEAL NEOPLASMS (IM) but not with BRAIN NEOPLASMS nor SPINAL CORD NEOPLASMS for intracranial or spinal meningioma unless site is particularly discussed
