AQP4 and myeloid sarcoma: Despite increasing knowledge of brain MRI characteristics in NMOSD, bilateral MCP lesions in patients with NMOSD‐related demyelination and inflammatory diseases are extremely rare, which makes them difficult to distinguish from atypical MS lesions, especially in AQP4‐IgG‐seronegative patients (Okamoto et al., 2003; Uchino et al., 2004).