Parinaud's is due to dorsal midbarin lesions such as compressions (tumors) , demyelination, or ischemic.
The syndrome is characterized by limitation of upward gaze, convergence retraction nystagmus, light near dissociation, and lid retraction (Collier's sign).
Parinaud was a french Ophthalmologist who studies under Charcot in the Salpetriere in Paris.

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