From the case: Ankylosing spondylitis

X-ray

Ankylosing spondylitis

 Interspinous lig...
Frontal
Interspinous ligament calcification - a "dagger spine" appearance. Diffuse syndesmophyitic ankylosis give a "bamboo spine" appearance
Modality: X-ray (Frontal)

- “ The findings of bamboo spine, dagger sign, syndesmophytes , bilateral sacro-iliatis with clinical history are suggestive of ankylosing spondylitis...”

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