Brain tumour. Magnetic resonance imaging (MRI) scan of an axial (horizontal) section through the head of a 43 year old woman with low grade glioma (white). Glioma, a central nervous system tumour, arises from glial cells. 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 for if the glioma returns. MRI uses radio waves and a magnet to obtain "slice" body images.
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