A glioblastoma multiforme (GBM) is the most aggressive type of brain tumor. It is a tumor that arises from glial cells inside the brain (known as glioma
). A large network of blood vessels makes it possible for astrocytes, the star-shaped cells that make up your connective brain tissue, to reproduce very quickly – making this condition especially acute. Cells that reproduce quickly create pressure inside the brain which causes a number of the symptoms of a gliobastoma.