Figure 1

Fat-suppressed T2-weighted MR images of Case 1. Coronal image (a) and axial image (b) from a 73-year-old Japanese woman with idiopathic optic perineuritis. There is a high signal intensity area around the right optic nerve and moderate swelling of the right extraocular muscles, suggesting inflammation around the optic nerve sheath and the extraocular muscles. Fat-suppressed T1-weighted magnetic resonance image obtained one month after steroid pulse therapy. This axial image (c) shows persistence of the high signal intensity area around the right optic nerve and moderate swelling of the right extraocular muscles. The extraocular muscles showed persistent moderate swelling (not visible on this image).