1. 17Sacroiliac Joint Abnormality

2. CLINICAL IMAGAGING
AN ATLAS OF DIFFERENTIAL DAIGNOSIS
EISENBERG
DR. Muhammad Bin Zulfiqar
PGR-FCPS III SIMS/SHL

3. • Fig SP 17-1 Ankylosing spondylitis. Bilateral,
symmetric obliteration of the sacroiliac joints.

4. • Fig SP 17-2 Inflammatory bowel disease. Bilateral,
symmetric involvement of the sacroiliac joints in
a patient with ulcerative colitis.

5. • Fig SP 17-3 Osteitis condensans ilii. Sharply demarcated
sclerosis of the ilia adjacent to the sacroiliac joints. The
sacrum is not affected, and the margins of the sacroiliac
joints are sharp and without destruction. The sclerosis that
overlies the sacral wing is actually in the ilium, where it
curves posteriorly behind the sacrum.4

6. • Fig SP 17-4 Psoriatic arthritis. Bilateral, though
somewhat asymmetric, narrowing of the
sacroiliac joints.

7. • Fig SP 17-5 Reactive arthritis. Bilateral, though
asymmetric, sclerosis and narrowing of the
sacroiliac joints with reactive sclerosis.

8. • Fig SP 17-6 Rheumatoid arthritis. Bilateral,
though asymmetric, sclerosis and narrowing
of the sacroiliac joints.

9. • Fig SP 17-7 Familial Mediterranean fever.
Bilateral, though asymmetric, narrowing, erosive
changes, and reactive sclerosis about the
sacroiliac joints.

10. • Fig SP 17-8 Healed tuberculosis. Obliteration
of the right sacroiliac joint. The left sacroiliac
joint remains intact.