Isolated optic neuritis
A patient presented with left eye pain and impaired vision for three days
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The left optic nerve is thickened/edematous and showing increased signal intensity in T2WIs with effacement of the peri optic CSF space
In the post-contrast series, there is a diffuse enhancement of the optic nerve from the optic disk to the optic chiasma. An incidental developmental venous anomaly in the right frontal lobe (partially imaged). No features of MS.
Optic neuritis could be isolated pattern (like in this case) or associated with multiple sclerosis.