Dagger sign in ankylosing spondylitis

Diagnosis certain

Citation, DOI, disclosures and case data

Citation:

Nemattalla W, Dagger sign in ankylosing spondylitis. Case study, Radiopaedia.org (Accessed on 31 Mar 2023) https://doi.org/10.53347/rID-8340

DOI:

https://doi.org/10.53347/rID-8340

Permalink:

https://radiopaedia.org/cases/8340

rID:

8340

Disclosures:

At the time the case was submitted for publication Wael Nemattalla had no recorded disclosures.

View Wael Nemattalla's current disclosures

Case published:

24 Jan 2010

Revisions:

6 times, by 5 contributors - see full revision history and disclosures

Systems:

Musculoskeletal, Paediatrics, Spine

Tags:

sign, ankylosing spondylitis

Quiz mode:

Included

From the case: Dagger sign in ankylosing spondylitis

x-ray

Frontal

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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Dagger sign (spine)

Dagger sign in ankylosing spondylitis

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