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2693 pages added, reviewed or updated during the last month (last updated: 14/4/2021)


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aetiology of cranial nerve XI palsy

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Accessory nerve palsy may have unilateral and bilateral causes.

Unilateral causes include:

  • trauma involving the neck or the base of the skull
  • syringomyelia
  • tumours - near the jugular foramen
  • poliomyelitis
  • platybasia

Bilateral causes include:

  • motor neuron disease
  • poliomyelitis
  • Guillain-Barre syndrome

Note that bilateral sternomastoid and trapezius paralysis may also occur in myotonic dystrophy.

Last reviewed 01/2018

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