![Radiology Signs on Twitter: "Q: What does the "inverted Napoleon hat sign" indicate? ANSWER: https://t.co/ys5PLY8Cm1 #FOAMrad #FOAMed https://t.co/6scqBNEemv" / Twitter Radiology Signs on Twitter: "Q: What does the "inverted Napoleon hat sign" indicate? ANSWER: https://t.co/ys5PLY8Cm1 #FOAMrad #FOAMed https://t.co/6scqBNEemv" / Twitter](https://pbs.twimg.com/media/CS2rtWnVAAETW-k.jpg)
Radiology Signs on Twitter: "Q: What does the "inverted Napoleon hat sign" indicate? ANSWER: https://t.co/ys5PLY8Cm1 #FOAMrad #FOAMed https://t.co/6scqBNEemv" / Twitter
Radiology Matrix - medical education - Matrix Case 334: - Inverted Napoleon hat sign - It is seen when there is bilateral spondylolysis with marked anterolisthesis of L5 on S1 The "brim"
![Angel Gómez-Cintrón, MD, MPH on Twitter: "Because I'm a radiology nerd and love Roentgen classic signs.... Inverted Napoleon Hat Sign. Seen on lumbar/spine AP views with L5-S1 bilateral spondylolysis and pronounced spondylolisthesis Angel Gómez-Cintrón, MD, MPH on Twitter: "Because I'm a radiology nerd and love Roentgen classic signs.... Inverted Napoleon Hat Sign. Seen on lumbar/spine AP views with L5-S1 bilateral spondylolysis and pronounced spondylolisthesis](https://pbs.twimg.com/media/E5KXU98X0AEgJ5I.jpg)