Among the 101 patients that were followed up for ≥6 months, the following diagnoses were noted: isolated ON (including one patient who tested positive for the MOG antibody and did not have any other abnormal neurologic finding except for ON), 48 (47.5%); recurrent ON, 12 (11.9%); MS, 19 (18.8%); NMOSD, 13 (12.9%); and ADEM-ON, 9 (8.9%). The gene discussed is MOG; the disease is myeloid sarcoma.