Ankylosing spondylitis

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)

There's more to see -- the rest of this topic is available only to subscribers.

© 2000–2025 Unbound Medicine, Inc. All rights reserved