Ankylosing spondylitis with dagger sign

Case contributed by Dr Mohammad Taghi Niknejad

Presentation

Known case of ankylosing spondylitis

Patient Data

Age: 50 years
Gender: Female

Typical appearance of bamboo spine with multiple syndesmophytes between the vertebral bodies. Degenerative changes as endplate sclerosis and mild irregularity are seen. Normal lordosis of the lumbar spine is reversed.

There is a single central radiodense line related to ossification of supraspinous and interspinous ligaments which is called dagger sign. 

Case Discussion

Typical bamboo spine and dagger sign in a known patient with ankylosing spondylitis. The dagger sign is a single central radiodense line on frontal radiographs related to ossification of supraspinous and interspinous ligaments which is seen in ankylosing spondylitis

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