<unk>  is the result of damage of motor fibers traveling from the cerebral cortex to the lower brain stem. This damage might arise in the course of a variety of neurological conditions that involve demyelination and bilateral corticobulbar lesions. Examples include: * Vascular causes: bilateral hemisphere infarction, CADASIL syndrome, artery of percheron infarct * Progressive supranuclear<unk>  * Amyotrophic lateral sclerosis * Parkinson's disease and related multiple system atrophy * Various motor neuron diseases, especially those involving demyelination * Multiple sclerosis and other inflammatory disorders * High brain stem tumors * Metabolic causes: osmotic demyelination syndrome * Neurological involvement in Behçet's disease * Brain trauma
Pseudobulbar palsy
Bulbar palsy
Trigeminal trophic syndrome
Subacute myelo-optic neuropathy
Trigeminal autonomic cephalgia
Todd's paresis
Central facial palsy
Cerebellopontine angle syndrome