CASE 94 History: A 55-year-old man presents with cauda equina syndrome. 1. What should be included in the differential diagnosis? (Choose all that apply.) c. Systemic lupus erythematosus 2. What imaging feature is helpful in suggesting ankylosing spondylitis as the underlying diagnosis rather than other causes of dural ectasia? a. Location within the cervical spine b. Involvement of more than three consecutive vertebral body segments c. Predominant involvement of the posterior elements d. Posterior vertebral body scalloping 3. What is the most likely mechanism of dural ectasia in patients with ankylosing spondylitis? a. Small vessel angiitis involving the vasa vasorum of the nerve roots b. Previous spinal irradiation for treatment of ankylosing spondylitis
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