Presentation
Lower back pain.
Patient Data
Age: 40 years
Gender: Female
From the case:
Dagger sign - ankylosing spondylitis
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The typical appearance of a bamboo spine with multiple syndesmophytes between the vertebral bodies is seen, along with a single central radiodense line on the frontal view related to the ossification of supraspinous and interspinous ligaments called dagger sign.
Hyperkyphosis is evident in the thoracic spine.
Additionally, bilateral sacroiliac sclerosis is evident.
Case Discussion
This case demonstrates the typical bamboo spine and dagger sign in a patient with known ankylosing spondylitis.
The dagger sign is a single central radiodense line on frontal radiographs related to the ossification of supraspinous and interspinous ligaments secondary to enthesitis, a radiographic feature of ankylosing spondylitis.
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