AQP4 and myelitis: 20 patients (49%) were diagnosed with AQP4-IgG seropositive NMOSD, 3 (7%) with AQP4-IgG seronegative NMOSD, 3 (7%) with MOGAD and 1 (2%) with neuro-Behçet disease, and 14 (34%) with other myelitis.