Meningioma eye bulge. Face of a 50-year-old woman with a bulging eye (proptosis, centre right) caused by a meningioma, a type of benign tumour. A meningioma is a tumour arising from the arachnoid membrane, one of the membranes that cover the brain. The tumour does not invade brain tissue, but may cause symptoms by pressing on vital structures. Symptoms include headaches, nausea and impaired mental functions. As the tumour is not part of the brain tissue, surgical removal is often possible. Otherwise radiotherapy is used.
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