SOVEREIGN / ISM / SCIENCE PHOTO LIBRARY SOVEREIGN / ISM / SCIENCE PHOTO LIBRARY
Benign brain tumours. Coloured magnetic resonance imaging (MRI) scan of a section through the head of a 48-year-old woman with a meningioma (orange, upper centre) over the temporal lobe of the brain (blue). Meningiomas are tumours arising from the meninges, the membranous layers surrounding the central nervous system. They are usually benign (non-cancerous) in nature. However, a small percentage are malignant (cancerous).
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