SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Glioma brain cancer. Coloured magnetic resonance imaging (MRI) scan of a brain in axial section, showing a glioma brain tumour. Glioma is a common brain cancer, comprising about 60% of all primary brain tumours that originate in the brain rather than being spread from elsewhere. Here, the large tumour (upper centre, black) is seen in the cere- brum of the brain (blue/yellow). Gliomas form from glial cells which form the connective tissue of the brain. Brain cancers are dangerous because of nerve cell destruction and build-up of pressure as the tumour expands. Symptoms may include muscle weakness, and loss of vision or speech. When possible tumours are removed by surgery.
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