Dagger sign in ankylosing spondylitis

Case contributed by Dr Wael Nemattalla

Dagger sign (Ankylosing spondylitis)

The dagger sign is a single central radiodense line on frontal radiographs related to ossification of supraspinous and interspinous ligaments.

Note the inflammatory involvement of the right hip as well.

Case Discussion

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The dagger sign is a single central radiodense line on frontal radiographs related to ossification of supraspinous and interspinous ligaments.

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Case information

rID: 8340
Published: 24th Jan 2010
Last edited: 10th May 2017
Inclusion in quiz mode: Included

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