Chiasmal neuritis in a 36-year-old man with sudden-onset visual changes in both eyes. A, Visual field testing showed a “junctional scotoma” with a central visual field defect in\ the left eye (left panel) and temporal hemianopic defect in the right eye (right panel). B, Coronal T1-weighted, postgadolinium MRI scan shows enhancement (arrow) of predominantly the left side of the chiasm. C, Follow-up MRI scan shows resolution of the enhancement shown in B. D, Repeat visual field testing shows substantial improvement in both eyes.