Presentation
Chronic lower back stiffness.
Patient Data
Age: 50 years
Gender: Male
From the case:
Ankylosing spondylitis
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The dense vertical line in the midline caused by ossification of interspinous and supraspinous ligaments; It is referred to as the Dagger sign
Marginal syndesmophytes along the lower thoracic and lumbar spine causing fusion (ankylosis) of vertebrae. The resulting appearance of the spine is referred to as Bamboo spine
Case Discussion
Advanced appearances of ankylosing spondylitis exhibiting two classical signs: