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Cranial mononeuropathy III - compression type

  • Alternative Names

    Third cranial nerve palsy; Oculomotor palsy; Pupil-involving third cranial nerve palsy

    • Double vision
    • Drooping of one eyelid (ptosis)
    • Enlarged pupil that reacts poorly to light
    • Headache or eye pain

    Other symptoms may occur if the cause is a tumor or trauma. Decreasing consciousness is a serious sign, because it could indicate brain damage or impending death.

    Signs and tests

    An eye examination may show:

    • Enlarged (dilated) pupil of the affected eye
    • Eye movement abnormalities
    • Eyes that are not aligned (dysconjugate gaze)

    A complete medical and nervous system (neurological) examination is performed to find out if any other parts of the body are affected.

    Other tests may include:

    • Blood tests
    • Tests to look at blood vessels to the brain (cerebral angiogram, CT angiogram, or MR angiogram)
    • MRI or CT scan of the brain
    • Spinal tap (lumbar puncture)

    You may need to be referred to a doctor who specializes in vision problems related to the nervous system (neuro-ophthalmologist).