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Optic nerve sheath meningioma. A. Axial T2 shows a homogeneous, hypointense mass (*) that mildly distorts the globe (arrow). B. Axial fat suppressed T1 with contrast shows homogeneous enhancement with a well-defined margin (blue arrow), and encasement of the optic nerve (white arrow). Globe distortion helps distinguish this lesion from lymphoma, as does the clinical history of slowly progressive, painless vision loss.
