JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Glioma brain tumour. Illustration of an overhead view of an axial section through the top of a human head and brain, showing a large haemorrhagic (bleeding) glioma (red, centre left) in the right temporal lobe. Gliomas are brain tumours that 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 brain tumours are removed by surgery.
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