Parinaud's Syndrome (example 1)
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"A Parinaud's Syndrome or Dorsal Midbrain
Syndrome is present in this young man. A pinealoma or other cause was
not found. Horizontal ductions are full. Supraduction was limited in
both eyes. Infraduction was full in both eyes. Horizontal saccades
are normal in velocity and amplitude. Voluntary upward saccades are
very limited in amplitude. They have a sarcuitious root with some
horizontal deviations. This pattern has been called serpentine eye
movements. Downward saccades are made in a series of small steps.
There is a suggestion of convergence and retraction movements when
the patient attempts to make voluntary upward saccades. Upward and
downward saccades were hypometric; their velocities, however, were
normal in this patient."
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