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A, The ONS is widened with expanded CSF hyperintensity surrounding the optic nerve, seen on axial T2-weighted MR imaging in conjunction with posterior flattening of the globes. ONS widening is thought to coincide with papilledema, which is seen in this 27-year-old woman who presented with headaches. B, Coronal T2-weighted MR imaging in a 55-year-old woman with headache demonstrates increased peri-ONS space marked by hyperintense signal intensity surrounding the optic nerve.
