ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Benign brain tumour. Coloured computed tomography (CT) scan of the brain of a 25 year old patient with a meningioma (purple). This is a benign (non-cancerous) tumour that arises from the meninges, the membranes that surround the brain. It was caused by radiation treatment the patient received in the previous few years for a brain injury.
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