SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Brain tumour. Coloured magnetic resonance imaging (MRI) scan of a coronal (front) section through the head and neck of a 43 year old woman with low grade glioma. Glioma, a central nervous system tumour, arises from glial cells. It is seen here as an orange mass (top right) within a cyst (white), towards the back of the brain (brown). The spine is at lower centre. About half of all primary brain tumours are gliomas. Low grade gliomas are slow growing tumours, which are much less likely to come back if they can be completely removed surgically. Radiotherapy may be kept in reserve as a treatment in case the glioma returns. MRI uses radio waves and a magnet to obtain "slice" body images.
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