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Midbrain signs

Authoring team

Ocular abnormalities are a prominent feature of space- occupying lesions in the midbrain. Presentation includes:

  • lesions of the upper midbrain - weakness of conjugate deviation upwards and ptosis
  • lesions of the lower midbrain - weakness of conjugate deviation downwards - often accompanied by ptosis and weakness of convergence
  • pupils unequal and dilated
  • reactions to light and to convergence-accommodation may be both lost, or just the former may be absent
  • nuclear ophthalmoplegia may be asymmetrical
  • headache, papilloedema, vomiting from hydrocephalus
  • nystagmus and ataxia may result from injury to cerebellar pathways
  • compression of lateral lemniscus may cause unilateral or bilateral deafness
  • tremors, tonic convulsions, loss of consciousness may occur

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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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