SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Meningioma brain tumour, coloured computed tomography (CT) scan. A meningioma (orange) is a benign (non-cancerous) tumour of the arachnoid mater, the central of the three membranes (meninges) that line the brain. This meningioma has been calcified (hardened by the deposition of mineral salts). Although it is not cancerous and very rarely turns cancerous, it can still cause significant symptoms due to the pressure that its growth puts on the brain beneath it. The exact symptoms depend on the area of the brain affected, but can include headaches, nausea and balance problems, as well as impairing cognitive function. Meningiomas can often be surgically removed.
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