BACKGROUND: Myelitis accompanied by a negative spinal cord MRI may lead to diagnostic uncertainty. OBJECTIVE AND METHODS: We retrospectively investigated the frequency of negative spinal cord MRI (performed <6 weeks from onset) in Mayo Clinic patients with myelin oligodendrocyte glycoprotein (MOG)-IgG-associated myelitis (2000-2019). RESULTS: The initial spinal cord MRI was negative in 7/73 (10%) patients, despite severe acute disability (median EDSS, 7 (range, 4.5-8)); myelitis symptoms/signs were frequent (paraparesis, neurogenic bladder, sensory level, Lhermitte's phenomenon). Myelitis lesions became overt at follow-up MRI in three patients. CONCLUSIONS: A negative spinal cord MRI should not dissuade from MOG-IgG testing in patients with acute/subacute myelitis.
BACKGROUND:Myelitis accompanied by a negative spinal cord MRI may lead to diagnostic uncertainty. OBJECTIVE AND METHODS: We retrospectively investigated the frequency of negative spinal cord MRI (performed <6 weeks from onset) in Mayo Clinic patients with myelin oligodendrocyte glycoprotein (MOG)-IgG-associated myelitis (2000-2019). RESULTS: The initial spinal cord MRI was negative in 7/73 (10%) patients, despite severe acute disability (median EDSS, 7 (range, 4.5-8)); myelitis symptoms/signs were frequent (paraparesis, neurogenic bladder, sensory level, Lhermitte's phenomenon). Myelitis lesions became overt at follow-up MRI in three patients. CONCLUSIONS: A negative spinal cord MRI should not dissuade from MOG-IgG testing in patients with acute/subacute myelitis.
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