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Niemann-Pick disease type C

Legend: Video shows a 30-year-old man with Niemann-Pick disease type C. He has relatively preserved smooth pursuit in the horizontal direction without end-gaze nystagmus. He can perform upward pursuit, but his downward pursuit movements are extremely slow. He also has relatively preserved horizontal saccades and has great difficulty in vertical saccades, particularly in the downward direction.

Duration: 0:51

Associated with: CONTINUUM: Lifelong Learning in Neurology. 25(4):1036-1054, August 2019

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