Presentation
Three days history of left orbital pain with blurred vision.
Patient Data
Swelling of the left optic nerve involving the retrobulbar intraorbital segment, extending to the intracranial segment with high T2 signal and enhancement in keeping with optic neuritis.
Circumferential thickening of the left optic nerve sheath with enhancement and inflammatory changes of the intraconal fat in keeping with a perineuritis.
Normal appearance of the right optic nerve and orbital muscles.
No demyelinating lesion seen at infra-or supratentorial levels.
Case Discussion
MRI features of a unilateral swelling with high T2 signal and enhancement of the left optic nerve indicating optic neuritis with associated perineuritis (circumferential thickening with enhancement of the optic nerve sheath and inflammatory changes of the intraconal fat).