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Late-onset hummingbird sign in a woman with fragile X premutation

      Highlights

      • Hummingbird sign is the midbrain atrophy without pontine atrophy.
      • Hummingbird sign was originally described in progressive supranuclear palsy.
      • Hummingbird sign has already been reported in Fragile X tremor-ataxia syndrome.
      • Fragile X tremor-ataxia syndrome can phenotypically mimic progressive supranuclear palsy.

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