However, Cobo-Calvo et al. reported that unilateral ON and a relapsing clinical course were observed in a group of MS patients positivity to anti-MOG antibodies.[11] In such cases, patients are more likely to test positive for oligoclonal bands, and MRI findings have been characterized according to paracortical and periventricular lesions similar to typical MS.[12] In our case, no abnormalities were detected on MRI. The gene discussed is MOG; the disease is myeloid sarcoma.