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CSF oligoclonal bands — SCE Neurology MCQ

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HardNeurological InvestigationsCSF oligoclonal bandsSCE Neurology

A typical optic-neuritis and partial-myelitis syndrome has MRI dissemination in space but no earlier attack or enhancing/non-enhancing lesion combination. CSF contains unmatched oligoclonal IgG bands. How do the bands affect diagnosis?

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Correct answer: E — They can substitute for dissemination in time under the 2017 McDonald criteria, clinically

The best answer is “They can substitute for dissemination in time under the 2017 McDonald criteria, clinically”. CSF-specific oligoclonal bands may satisfy dissemination in time, but only within a typical demyelinating presentation with dissemination in space and careful exclusion of alternatives. “They establish neuromyelitis optica regardless of aquaporin-4 status” remains a plausible alternative in a different presentation, but it does not fit the decisive finding or management threshold here. “They prove infection because intrathecal immunoglobulin is nonspecific” remains a plausible alternative in a different presentation, but it does not fit the decisive finding or management threshold here. “They replace the requirement for a typical clinical syndrome” remains a plausible alternative in a different presentation, but it does not fit the decisive finding or management threshold here. “They exclude multiple sclerosis when the CSF cell count is normal” remains a plausible alternative in a different presentation, but it does not fit the decisive finding or management threshold here.

Reference: 2017 McDonald criteria for multiple sclerosis: https://pubmed.ncbi.nlm.nih.gov/29275977/