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One-and-a-half Syndrome
    * Eye movement findings on exam.
  • Axial MRI section of Brain through the pons at the level of the middle cerebellar peduncles.
  • Coronal illustration of the brainstem with key conjugate horizontal eye movement pathways.
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One-and-a-half Syndrome

    * This patient was only able to produce one of the four major horizontal eye movements (his right eye could adduct).
  • His other three eye movements were pathologic: right eye could NOT abduct. Left eye could neither adduct nor could it abduct.