CASE 82 History: A 50-year-old woman presents with persistent low back pain for 6 years, with worsening over the past few months. 1. What should be included in the differential diagnosis? (Choose all that apply.) a. Pars interarticularis defects e. Spina bifida 2. Where are retrosomatic clefts most frequently found? c. Lumbar spine d. Sacrum 3. Which of the following statements regarding retrosomatic clefts is true? a. They are more common in men. b. They are more frequently unilateral. c. Pedicular clefts cannot be differentiated from pars interarticularis defects. d. They most frequently occur at a single vertebral level. 4. Which of the following clefts is a result of failure of fusion of the primary ossification centers? a. Spina bifida
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