Sacroiliitis (differential)

Last revised by Dr Joachim Feger on 21 Aug 2021

Sacroiliitis (rare plural: sacroiliitides), an inflammation of the sacroiliac joint, can be a manifestation of a wide range of disease processes. The pattern of involvement is helpful for narrowing down the differential diagnosis.

Usually bilateral and symmetrical 
Usually bilateral but asymmetrical 
Usually unilateral 

Differential diagnosis

The following conditions can mimic a sacroiliitis

See also

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Cases and figures

  • Case 1: sacroiliitis on left - cause unknown
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  • Case 2: septic arthritis with psoas abscess
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  • Case 3: ankylosing spondylitis
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  • Case 3: bone scan
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  • Case 4: psoriatic arthropathy
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  • Case 5: bilateral- unknown cause
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