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.