Background: The variability in cerebrospinal fluid (CSF) findings of myelin oligodendrocyte glycoprotein-IgG-associated disorder (MOGAD) is not fully elucidated. Objective and Methods: We retrospectively analyzed 203 attack-associated CSFs from Mayo Clinic patients (2000-2019) with MOGAD. Results: White-blood-cell (>5/mm3) elevation was less with clinically isolated optic neuritis (23%), compared to myelitis, brain/brainstem attacks, or combinations thereof (>70%), p<0.0001. CSF pleocytosis in optic neuritis was more common in patients with coexisting asymptomatic brain and/or spine MRI T2-lesions (53%) than in those without (16%), p=0.005. Abnormal CSF oligoclonal bands ranged from 1% (optic neuritis) to 18% (brain/brainstem attacks). CSF pleocytosis was less common after immunotherapy. Conclusions: CSF findings in MOGAD vary by attack phenotype and preceding treatment.
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