Ankylosing spondylitis (Radiology)

Ankylosing spondylitis

Image findings

• SI joint: iliac side>sacrum, anteroinferior side의 synovial joint 주로 침범.
  • New York criteria: SI joint plain film
• spine
  • Romanus lesion: shiny corner sign, anterior/posterior spondylitis
  • Andersson lesion: noninfectious spondylodiskitis, endplate central portion
  • Annulus fibrosus의 ossification: bamboo spine
• hip joint
• Pubic symphysis bridging/fusion
• Inflammatory lesions: bone marrow edema(osteitis), enthesitis, capsulitis

DDx

• Osteitis condensans ilii
• reactive arthritis of SI joint
• IBD related arthritis