Dagger sign (spine)

Last revised by Ciléin Kearns on 21 Jan 2023

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 1. It is possible for the radiodense line to extend into the sacrum 2

Radiographic features

On plain frontal radiographs it is noted a a linear increased density running along the spinous processes 3.

 

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Cases and figures

  • Figure 1: photograph of dagger
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