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The region of marked FDG avidity centred in the right orbit corresponds to a lobulated, heterogeneously enhancing intra and extraconal mass which surrounds the right optic nerve to abut the posterior margin of the globe, without extension into the globe itself. The adjacent conus muscles are replaced or severely displaced by the mass, which progresses posteriorly through the orbital apex along the path of the right pre-chiasmatic optic nerve, almost entirely filling the right cavernous sinus, while preserving the right cavernous ICA flow void.
Tumour appears to extend beyond the roof of the right orbit suggesting extension beyond the periosteum intracranially.