Sacroiliitis (differential)

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Sacroiliitis (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

enteropathic arthritis
- Crohn disease
- ulcerative colitis
ankylosing spondylitis
rheumatoid arthritis ¹
hyperparathyroidism: not a true sacroiliitis but can mimic appearances
osteitis condensans ilii
multicentric reticulohistiocytosis
Whipple disease ²

Usually bilateral but asymmetrical

Usually unilateral

neoplastic destructive process
infective
- pyogenic septic arthritis
- tuberculous sacroiliitis
- brucellosis ^_3-4
paraplegia
SAPHO syndrome ⁵

5. Cotten A, Flipo RM, Mentre A, Delaporte E, Duquesnoy B, Chastanet P. SAPHO syndrome. Radiographics : a review publication of the Radiological Society of North America, Inc. 15 (5): 1147-54. <a href="https://doi.org/10.1148/radiographics.15.5.7501856">doi:10.1148/radiographics.15.5.7501856</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/7501856">Pubmed</a> <span class="ref_v4"></span>

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