Dagger sign

Dagger sign is a radiologic sign seen in advanced cases of ankylosing spondylitis.^[1] The appearance of a dagger is seen in the X-ray because of ossification of the supraspinous and infraspinous ligaments.^[2] As a result, a central dense line of sclerosis, resembling a dagger can be seen in the AP radiograph of spine and pelvis.^[3]

References

^ Jurik, Anne Grethe (8 January 2011). "Imaging the spine in arthritis—a pictorial review". Insights into Imaging. 2 (2): 177–191. doi:10.1007/s13244-010-0061-4. ISSN 1869-4101. PMC 3259357. PMID 22347946.
^ Kumar, Rajiv Ranjan; Jha, Saket; Sharma, Aman (31 December 2019). "Dagger sign of ankylosing spondylitis". Oxford Medical Case Reports. 2019 (12): 502–503. doi:10.1093/omcr/omz117. ISSN 2053-8855. PMC 6937459. PMID 31908821. Retrieved 1 November 2021.
^ "Ankylosing spondylitis - dagger sign". Radiology at St. Vincent's University Hospital. Retrieved 1 November 2021.

[1] Jurik, Anne Grethe (8 January 2011). "Imaging the spine in arthritis—a pictorial review". Insights into Imaging. 2 (2): 177–191. doi:10.1007/s13244-010-0061-4. ISSN 1869-4101. PMC 3259357. PMID 22347946.

[2] Kumar, Rajiv Ranjan; Jha, Saket; Sharma, Aman (31 December 2019). "Dagger sign of ankylosing spondylitis". Oxford Medical Case Reports. 2019 (12): 502–503. doi:10.1093/omcr/omz117. ISSN 2053-8855. PMC 6937459. PMID 31908821. Retrieved 1 November 2021.

[3] "Ankylosing spondylitis - dagger sign". Radiology at St. Vincent's University Hospital. Retrieved 1 November 2021.

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