The “inverted Napoleon’s hat” sign

  • Thomas E. PendergrastEmail author
  • Raymond B. Dyer
Classics in Abdominal Radiology


Compliance with ethical standards

Conflict of interest

Thomas Pendergrast and Raymond Dyer declares that they have no conflict of interest.


  1. 1.
    Allan S (2015) 20th June 1815, Napoleon’s Hat. Warwick Digital Humanities 2015. Accessed 13 December 2018
  2. 2.
    Talangbayan LE (2007) The inverted Napoleon’s hat sign. Radiology 243:603–604CrossRefGoogle Scholar
  3. 3.
    Wiltse LL, Newman PH, Macnab I (1976) Classification of spondylolysis and spondylolisthesis. Clin Orthop Relat Res 117:23–29Google Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Radiology, Wake Forest Baptist Medical CenterWake Forest University School of Medicine, Medical Center Blvd.Winston-SalemUSA

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