Progressive Motor Impairment from Intracerebral Critical Demyelinating Lesions in Humans
A study reviewed 17 individuals with intracerebral critical demyelinating lesions, finding that 70% had lesions in cerebral white matter and 94% experienced progressive spastic hemiparesis. Cognitive impairment was noted in half of the cases. There's evidence of abnormal immunoglobulin G levels suggestive of MS in most patients studied.
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Why it matters
This research highlights a potential association between certain brain lesions and progressive motor impairment, which could lead to further investigation into their prevalence and implications for MS.
What this does not prove
The study is retrospective, does not prove causation, and lacks comprehensive diagnostic alternatives, limiting broader conclusions about the population.
Next milestone
No next milestone was established from the available source.
Study facts
- Study design
- Observational
- Participants / samples
- 17 · number of individuals with intracerebral critical demyelinating lesions
- Randomised
- Not reported
- Controlled
- Not reported
- Primary endpoint met
- Not reported
- Relevant MS type
- Not reported
- Publication date
- 2026-09-28
- Evidence reviewed
- Abstract only
- Regulatory approval
- Not reported
- Research areas
- Not classified
Original sources
- Primary evidenceProgressive motor impairment from intracerebral critical demyelinating lesions. ↗DOI: 10.1007/s00415-026-14168-3
Supporting passages (7)
study designMETHODS: We retrospectively reviewed people seen at Mayo MS Clinic (2002-2025) with progressive central nervous system demyelinating disease and progressive (≥ 1 year) upper motor neuron weakness anatomically associated with a presumed demyelinating lesion of the cerebral white matter, internal capsule, or upper brainstem, excluding alternative spinal cord or CMJ lesions.
subjectsRESULTS: Seventeen people had an intracerebral critical demyelinating lesion: cerebral white matter in 12 (70%), internal capsule in 3 (18%) and upper brainstem in 2 (12%).
sample sizeRESULTS: Seventeen people had an intracerebral critical demyelinating lesion: cerebral white matter in 12 (70%), internal capsule in 3 (18%) and upper brainstem in 2 (12%).
sample size basisCONCLUSIONS: Intracerebral critical demyelinating lesions associated with progressive motor impairment can rarely occur along the corticospinal tracts of the brain.
findingsSeventeen people had an intracerebral critical demyelinating lesion: cerebral white matter in 12 (70%), internal capsule in 3 (18%) and upper brainstem in 2 (12%).
publication datePublication date: 2026-09-28
limitationsTitle: Progressive motor impairment from intracerebral critical demyelinating lesions.
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