[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; they have a predilection to arise from the parasagittal region, cerebral convexity, sphenoidal ridge, olfactory groove, and spinal canal. ( CSP )]
UMLS (NCI) C0025286 Relation/PAR: Meningeal Neoplasm
Neoplasms, Nerve Tissue
Central Nervous System Neoplasm
blood vessel neoplasm