ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Brain tumour. Coloured magnetic resonance imaging (MRI) scan of an axial (horizontal) section through the head of a 44 year old man with a brain glioma (dark red spots). The front of the head is at bottom. Glioma, a central nervous system tumour, arises from glial cells. About half of all primary brain tumours are gliomas.
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