CASE 2 History: A 55-year-old man presents with myelopathy. 1. What should be included in the differential diagnosis? (Choose all that apply.) b. Ossification of ligamentum flavum c. Ossification of the posterior longitudinal ligament (OPLL) 2. Which vertebral levels are most severely involved with OPLL? a. C2-C4 b. C4-C6 c. C7-T2 d. T3-T5 3. Which one of the four types of OPLL, according to the classification based on CT appearance, may be difficult to differentiate from an osteophyte? a. Type I b. Type II c. Type III d. Type IV 4. Which imaging technique is preferred for diagnosing OPLL? b. CT
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