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Diffuse decrease in bone density is seen. Kyphosis of the spine with syndesmophytes and ankylosing of the spinal vertebrae are seen. Calcification of the interspinous ligaments are also seen. Severe changes of sacroiliitis is noted with bony erosion, vacuum phenomina and sclerosis at the inferior iliac component of the SI joint. However no complete ankylosis seen. No evidence of fracture.