AQP4 and myeloid sarcoma: However, results concerning ovoid MS‐like lesions are equivocal, with some of the studies reporting higher prevalence of such lesions in CNS imaging of AQP4‐IgG(−) (Downer et al., 2012; Fan et al., 2017; Matsushita et al., 2010) and others in AQP4‐IgG(+) patients (Cabrera‐Gomez & Kister, 2012).