Radiology Teaching Files > Case 333821

Contributed by: Safwan Halabi, Resident, Cincinnati Children's Hospital Medical Center, Ohio, USA.
Patient: 34 year old female

- Lower abdominal pain
- Negative urine pregnancy test


Fig. 1

Fig. 2

- Bilateral, symmetric sclerosis of the iliac side of the sacro-iliac joint
- The sclerosis appears triangular with the base located inferiorly
- Erosions of the SI joint are absent

Diagnosis: Osteitis condensans ilii
Discussion: Osteitis condensans ilii and and osteitis pubis are two conditions occurring predominantly as complications of pregnancy. In the former, a well-defined triangular sclerosis occurs on the ilac aspect of the sacroiliac joint, with bone eburnation on the inferior portion of the bone. A "low back" syndrome or "fibrositis" syndrome may be recognized in some patients. Osteitis condensans ilii may be related to mechanical stress across the sacroiliac joint and increased vascularity in pregnancy, although other causes have also been suggested. A relationship to ankylosing spondyitis may exist.
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Additional Details:

Case Number: 333821Last Updated: 02-11-2004
Anatomy: Skeletal System   Pathology: Trauma
Modality: CT, Conventional RadiographExam Date: 02-09-2004Access Level: Readable by all users
Keywords: osteitis, condensans, ilii

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