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Scans were performed with and without intravenous contrast, demonstrating a vividly enhancing 3.9 x 4.2 cm diameter mass arising from the planum sphenoidale and floor of the anterior cranial fossa. There is significant vasogenic oedema within the right frontal lobe extending across the corpus callosum into the left frontal lobe. Sphenoid bony infiltration and hyperostosis evident. The findings are typical of an anterior cranial fossa meningioma.