- •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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