CASE 31 History: A 42-year-old man presents with severe low back pain and bilateral leg weakness. 1. What should be included in the differential diagnosis? (Choose all that apply.) a. Meningioma b. Lymphoma e. Ossification of the posterior longitudinal ligament 2. What is the frequency of bulging annulus on MRI in asymptomatic individuals? a. Less than 5% b. About 25% c. About 50% 3. What is the frequency of disk herniation on MRI in individuals with no back pain? a. Less than 5% b. About 25% c. About 50% 4. Which of the following statements best describes an extruded disk? a. Disk material has a broad-based neck wider than the edges of the herniated material. b. Displacement of disk material involves more than 50% of the disk circumference. c. There is radial separation of the annular fibers.
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