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Meningioma, arising from the
meninges covering the optic nerve. Mass lesion surrounding the
optic nerve, on occasion calcified and intensely enhancing.
Linear bands of enhancement, the "tram track" sign,
represent tumor encasing the optic nerve.
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Lymphoma
Orbital lymphoma displacing the globe laterally and anteriorly.
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Orbital Cellulitis
Orbital cellulitis with soft tissue swelling seen anterior to the
orbital septum, in addition to stranding of the retro-bulbar fat
and proptosis of the globe. This post-septal penetration
differentiates orbital from peri-orbital cellulitis.
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Grave’s Ophthalmopathy
Graves ophthamopathy causes infiltration of the extra-ocular
muscles by glycoproteins and mucopolysaccarides. There is often
relative sparing of the lateral rectus muscle. Tendinous
insertions tend to be spared.
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