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Related Experiment Videos

Monocular elevation paresis caused by an ipsilateral lesion.

C S Ford, G M Schwartze, R G Weaver

    Neurology
    |September 1, 1984
    PubMed
    Summary

    A brainstem tumor caused a rare eye movement disorder called monocular elevation paresis. This finding suggests a new cause for this condition, impacting the brainstem

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Neurology

    Background:

    • Monocular elevation paresis (MEP) is a rare ophthalmological condition affecting eye movement.
    • Previous theories attributed MEP to lesions in the contralateral pretectum, lacking definitive proof.

    Observation:

    • A 52-year-old woman presented with right-sided MEP, equally severe in abduction and adduction.
    • Computed tomography (CT) revealed a small, right-sided tumor at the mesodiencephalic junction.

    Findings:

    • The study documents an ipsilateral brainstem etiology for MEP.
    • This suggests a lesion affecting the upgaze efferents from the ipsilateral rostral interstitial nucleus of the medial longitudinal fasciculus (riMLF).

    Implications:

    • This finding challenges previous etiological assumptions for MEP.
    • It highlights the role of the mesodiencephalic junction and riMLF in vertical eye movement control.
    • Provides new insights into the neuroanatomy of gaze control and potential causes of MEP.

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