A glioblastoma or malignant glioma is a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatal and occurring in the cerebral hemispheres
A glioblastoma is generally thought of as the worst kind of brain cancer. Malignant gliomas strike almost 9,000 Americans a year. Survival statistics are grim - few live three years and for the worst subtype, half die within a year.