CASE 110 History: A 55-year-old man presents with back and left hip pain and numbness of the left lower extremity. 1. What should be included in the differential diagnosis? (Choose all that apply.) a. Tarlov cyst d. Migrated sequestered disk fragment 2. What is the likely etiology of this lesion? b. Facet joint degenerative changes 3. At what spinal level is this lesion most commonly found? a. L2-3 b. L3-4 c. L4-5 d. L5-S1 4. What would be the most likely explanation for sudden exacerbation of chronic back pain in this patient? a. Cyst rupture c. Malignant degeneration to synovial sarcoma
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