CASE 90 History: A 43-year-old woman presents with back pain radiating to the right leg. The patient has a history of keyhole laminectomy performed 10 years ago. 1. What should be included in the differential diagnosis? (Choose all that apply.) a. Dural arteriovenous fistula c. Nerve root enhancement secondary to disk herniation 2. What is the frequency of lumbar nerve root enhancement on contrast-enhanced MRI after surgery for lumbar disk herniation? a. Less than 5% b. 25% c. 50% 3. What additional intradural structure may produce the findings seen in this case? 4. Which of the following statements is true?
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