Ankylosing spondylitis

Ankylosing spondylitis is a topic covered in the Diagnosaurus.

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DDx

  • Other causes or mimics of sacroiliitis: reactive arthritis (Reiter's syndrome), psoriatic arthritis, inflammatory bowel disease, osteitis condensans ilii, hyperparathyroidism, Whipple's disease
  • Diffuse idiopathic skeletal hyperostosis (DISH; in elderly)
  • Synovitis-acne-pustulosis-hyperostosis-osteitis (SAPHO) syndrome
  • Sciatica
  • Lumbar disk herniation, spinal stenosis, or facet joint degenerative arthritis
  • Ochronosis (alkaptonuria)

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Last updated: December 1, 2014