ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Coloured Computed Tomography (CT) scan in axial section through the eyeballs of a 48 year old patient, showing an optic nerve tumour (meningioma, yellow). A meningioma is a benign (non-cancerous) tumour which can lead to blindness due to compression of the optic nerve.
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