Dagger sign (spine)

Last revised by Dr Mohammad Taghi Niknejad on 17 Aug 2021

The dagger sign is a radiographic feature seen in ankylosing spondylitis as a single central radiodense line on frontal radiographs related to ossification of the supraspinous and interspinous ligaments secondary to enthesitis 2. It is possible for the radiodense line to extent into the sacrum 3

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Cases and figures

  • Figure 1: photograph of dagger
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  • Case 1
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  • Case 2
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  • Case 3
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  • Case 14
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