IMPORTANT: We currently have a number of bugs related to image cropping and are actively trying to resolve them. In the meantime, we have disabled cropping. Apologies for any inconvenience. Stay informed: radiopaedia.org/chat

Ankylosing spondylitis - with dagger sign

Case contributed by Mohammed Al Khader.O.Thabet
Diagnosis certain

Presentation

Adult female with history of loins pain , CT study was done to rule out renal stone.

Patient Data

Age: Adult
Gender: Female

Incidental findings on scout view and coronal/sagittal CT images include a dagger sign of the spine which is a result of ossification of interspinous and supraspinous ligaments.

Case Discussion

The dagger sign is an imaging feature seen in ankylosing spondylitis as single central radiodense line related to ossification of supraspinous and interspinous ligaments.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.