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Bilateral lower motor neurone causes

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Causes include:

  • Guillain-Barre syndrome (post-infective polyneuritis)
  • uveoparotid fever (a manifestation of sarcoidosis)
  • poliomyelitis
  • lepromatous leprosy - may cause bilateral facial nerve palsies
  • facial nerves may be involved bilaterally in their intracerebral course by:
    • cerebropontine angle tumours particularly acoustic neuromas)
    • leukaemic infiltration
    • granulomatous meningitis
  • Melkersson's syndrome - facial palsy may be unilateral or bilateral
  • Bell's Palsy - rarely may be bilateral

Bilateral facial weakness may also occur in myopathies and myasthenia gravis, which are not the result of facial nerve pathology.

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