MOG and myeloid sarcoma: Retrospective data of MOG antibody results was available from 97/189 MS patients, 89 results from assay A and 23 results from assay B. 30/30 (100.0%) MOGAD patients and 1/97 (1.1%) MS patients tested positive for MOG antibodies, but 18/30 (60.0%) MOGAD patients and none of the MS patients showed a clear positive (high-titer) MOG antibody result (Supplementary Table 2).