Tumors
Gliomas are
malignant Tumors that
arise from glial
cells and comprise 40 to 45 percent of all
nervous system tumors. Meningiomas arise from fibrous cells in the coverings of the
brain and spinal cord and are nonmalignant. A variety of primary tumors are recognized; they are named according to the tissue of origin. Malignant cells from tumors in other tissues, such as lung, skin, and breast, are frequently seeded in the brain after being carried in the circulation. The seeding process is called metastasis, and the resulting tumors are termed secondary tumors because of their origin in
tissues outside of the nervous system.
More abstracts about the TUMOURS OF THE NERVOUS SYSTEM