l computed tomography (CT) scan with contrast of a patient with a protruding right eye (proptosis) showing a solid mass on the sphenoid bone. This is a meningioma, a benign (non-cancerous) tumour that arises from the meninges, the membranes that surround the brain. There is an exostosis (bony spur) on the sphenoid bone that is vividly enhanced by the contrast medium