Brain tumour. Computer-enhanced image of a section through a brain showing a large tumour (green,right) in one of the temporal lobes. This is a glioblastoma,a relatively common brain tumour arising from astrocyte cells in the brain. Astrocytes are a type of glial cell,which support the brain's nerve cells. A glioblastoma is a fast- growing and malignant tumour. In common with other types of brain tumour,symptoms may include headaches,muscle weakness,epileptic seizures,sensory disturbances and speech difficulties. If the tumour is not accessible by surgery,radio- therapy and chemotherapy (anti-cancer drugs) may effect a cure,but the prognosis is usually bleak |