Presentation
Low back pain.
Patient Data
Age: 40 years
Gender: Male
From the case:
Inverted Napoleon hat sign
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The AP view shows the inverted Napoleon hat sign, indicative of bilateral L5 pars defects and high grade anterolisthesis.
In the lateral view pars interarticularis defect and spondyloptosis are noted.
Case Discussion
Spondyloptosis is the most advanced stage of anterolisthesis and represents a displacement greater than 100%.
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