Osteitis Condensans Ilii

osteitis condensans ilii

Osteitis condensans ilii is characterised by benign sclerosis of the ileum adjacent to the sacroiliac joint. It is typically bilateral and symmetrical, and tends to be triangular in shape. The sacroiliac joint is not involved. It is most commonly seen in multiparous females; the underlying aetiology is believed to be mechanical stress across the SI joint. It is usually asymptomatic but uncommonly may cause lower back pain. The differential diagnosis is sacroiliitis, but with osteitis condensans ilii the SI joint is normal with no irregularity, erosions or loss of joint space.

References:
1. Dahnert W. Radiology Review Manual, 5th edition. Lippincott, Williams and Wilkins 2003
2. Medcyclopaedia.com

Credit: Dr Donna D'Souza