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

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: 13th Aug 2019
Inclusion in quiz mode: Included

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