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The left optic nerve shows diffuse fusiform enlargement measuring 35 x 15 x 15 mm. It is involving the whole intra-orbital and intra-canalicular segments of the left optic nerve. It shows T1 hypointense, T2 heterogenous and FLAIR hyperintense signal intensity, restricted DWI, and intense homogenous post-contrast enhancement pattern.
Left proptosis is noted.