Midsagittal MRI of the brain demonstrates prominent midbrain atrophy without pontine atrophy (divided by white line), forming the silhouette of the “penguin” or “hummingbird” sign
Graber, J. J., & Staudinger, R. (2009). Teaching Neuro Images : “Penguin” or “hummingbird” sign and midbrain atrophy in progressive supranuclear palsy. Neurology, 72(17). https://doi.org/10.1212/wnl.0b013e3181a2e815
T1-weighted sagittal MRI revealing the superior margin of the midbrain (yellow arrows). Notice the convex superior margin of the midbrain that could be seen in 2019 (A) and the concave appearance in 2022 (B), the so-called “hummingbird” sign.
Nicoleta Lupascu, Ioan Cristian Lupescu, Ionuț Caloianu, Florin Naftanaila, Remus Relu Glogojeanu, Sirbu, C. A., & Mitrica, M. (2023). Imaging Criteria for the Diagnosis of Progressive Supranuclear Palsy: Supportive or Mandatory? Diagnostics, 13(11), 1967–1967. https://doi.org/10.3390/diagnostics13111967
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