CASE 13 History: A 65-year-old man presents with long-standing stiffness and back pain. 1. What should be included in the differential diagnosis? (Choose all that apply.) a. Diffuse idiopathic skeletal hyperostosis 2. What laboratory study may help narrow the differential diagnosis? a. HLA-A3 b. HLA-B27 c. HLA-DR2 d. HLA-DR4 3. All of the following spine abnormalities are associated with ankylosing spondylitis except: b. Dural ectasia or vertebral scalloping c. Increased incidence of spinal fractures d. Platybasia
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