?:definition
|
-
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.
|