Sacroiliitis
From Radipedia
Symmetric - PAIR pneumonic
Bilateral Symmetric
- Ankylosing spondylitis
- Irritable bowel disease
Bilateral Asymmetric
Unilateral
Mimic
- Osteitis condensans ilii - sclerosis of iliac side only
- Osteoarthritis
- Renal osteodystrophy - widening on SI joint from resorption
