From the case: Ankylosing spondylitis

X-ray

Ankylosing spondylitis

Interspinous liga...
Frontal
Interspinous ligament calcification - a "dagger spine" appearance. Subchondral erosions, sclerosis and proliferation on the iliac side of SI joints
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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