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Radiological appearances of meningiomas. a Magnetic resonance imaging (MRI) showing a large convexity meningioma with edema and displacement of the midline to the anatomical left. b MRI section illustrating a WHO grade I convexity meningioma invading the frontal bone. c Large meningioma arising in the cerebello-pontine angle compressing the brain stem. d Computerized tomography showing multiple meningiomas and postoperative changes in a patient with neurofibromatosis type 2
