| This
is a type (subcategory) of astrocytoma. Astrocytomnas are the
most common brain tumor which start growing in the brain, and there
are roughly 12,000 new cases per year. Astrocytomas are broken
down in grading systems into either three or four grades.
On the four tier grading system, grade four is the most agressive,
and is called a glioblastoma multiforme. These tumors arise
from the "insulating cells" of the brain, known as astrocytes,
and generally exist without a discrete border. |
Glossary 
