List six radiographic findings associated with AS.

1. Sacroiliitis, usually bilateral and symmetric; characterized by erosions and patchy sclerosis
2. Enthesopathy
3. Peripheral arthritis (30% of patients)
4. Anderson's lesion (pseudoarthrosis of the spine)
5. Bamboo spine (i.e., multilevel spinal fusion with syndesmophytes, or calcification of the outer rim of the annulus fibrosis, and resorption of vertebral end plates)
6. Uniform joint space narrowing of the hips