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Magnetic resonance imaging showing a large tumour arising from the right optic nerve and growing superiorly in an exophytic pattern. The lesion is prominently hypointense on the axial T2-weighted (a) and isointense to the muscles on the axial T1-weighted (b) images. On contrast-enhanced, fat suppressed T1-weighted axial (c) and coronal (d) images, there is avid enhancement of the lesion that is partially surrounding and overlying the right optic nerve (arrow)
