Brain stem features
Features directly attributable to brainstem demyelination in MS include:
- paroxysmal features - transient dysarthria or cerebellar ataxia, usually of 20-30 minutes duration. Results from ephectic conduction between adjacent demyelinated axons.
- vertigo due to impairment of balance
- diplopia:
- from demyelination of III, IV and VI nerves before leaving the brain stem; may be associated with trigeminal neuralgia with ipsilateral numbness and facial weakness due to proximity of III, IV and VI, to V and VII cranial nerves
- or due to demyelination of the median longitudinal bundle - internuclear ophthalmoplegia
- in more advanced disease, there may be pseudobulbar palsy, spastic dysarthria and emotional lability due to bilateral demyelination of pyramidal neurons
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