Benign brain tumours. Coloured magnetic resonance imaging (MRI) scan of an axial section through the head of a 39-year-old man with multiple meningiomas (white) over the frontal lobe of the brain (green). 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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