Optic neuritis and computed tomography.

A forty year old Lebanese man presented to Royal Prince Alfred Hospital with unilateral visual loss and disc oedema. Computed Tomography (CT) of his orbit demonstrated diffuse thickening and tortuosity consistent with an optic nerve tumour. Surgical exploration of the orbit was averted when the patient reported subjective visual improvement. Two months later, CT demonstrated an optic nerve which was well within normal limits.