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Related Experiment Videos

Supranuclear paralysis of monocular elevation.

S Lessell

    Neurology
    |December 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    A patient with lung cancer developed a rare eye movement disorder due to a midbrain lesion. This supranuclear ophthalmoplegia affected voluntary eye elevation, specifically impacting the left eye.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Oncology

    Background:

    • Supranuclear ophthalmoplegia is a rare condition affecting voluntary eye movements.
    • Bronchogenic carcinoma can metastasize to various parts of the brain.

    Observation:

    • A patient with bronchogenic carcinoma presented with isolated, voluntary left eye elevation deficit.
    • Clinical examination revealed normal primary eye position and Bell phenomenon, suggesting a supranuclear lesion.
    • Radiological findings indicated a lesion in the rostral midbrain.

    Findings:

    • Autopsy revealed a metastatic tumor in the right pretectum.
    • The tumor likely interrupted specific neural pathways controlling eye elevation.
    • This involved axons projecting to the superior rectus subnucleus of the ipsilateral oculomotor nucleus and the inferior oblique subnucleus of the contralateral oculomotor nucleus.

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    Implications:

    • This case highlights a specific mechanism of supranuclear ophthalmoplegia secondary to brain metastasis.
    • Understanding these pathways is crucial for diagnosing and managing complex neurological deficits in cancer patients.
    • The findings contribute to the understanding of oculomotor control and the effects of focal brain lesions.