BACKGROUND AND OBJECTIVES: AQP4-IgG-seronegative Neuromyelitis Optica Spectrum Disorders (AQP4-IgG-seronegative NMOSD) represent a distinct and rare subtype of Neuromyelitis Optica Spectrum Disorders (NMOSD). Diagnosis and management of this condition pose significant challenges in clinical practice. Here, we present two cases of AQP4-IgG-seronegative NMOSD, which demonstrated a favorable response to personalized ofatumumab (OFA) therapy. METHODS: Two patients, confirmed negative for both AQP4-I...