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(A) At presentation brain magnetic resonance imaging revealed bilateral swelling of optic nerves extending from the retina to the optic chiasm and swelling of the left optic tract. T1-weighted image in the axial plane shows diffuse enlargement of both optic nerves (arrows). (B) Corresponding T1-weighted image in the axial plane of the same patient 3 months after treatment demonstrates decrease in the size of both nerves.
