Ankylosing spondylitis

Case contributed by J Yeung
Diagnosis almost certain


Male patient with back pain


There is fusion of bilateral sacroiliac joints, syndesmophytes and squaring of vertebral bodies.

Case Discussion

Sacroiliitis may present as sclerosis of joint margins which could be asymmetrical at early stage of disease, but is bilateral and symmetrical in late disease. Squaring of anterior vertebral margins is due to osteitis of anterior corners. Syndesmophytes are due to ossification of outer fibers of annulus fibrosus.

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