CASE 46 History: A 58-year-old woman presents with a 1-year history of back pain, left lower extremity pain, and numbness in the left foot. 1. What should be included in the differential diagnosis? (Choose all that apply.) a. Chordoma 2. What percentage of spinal schwannomas occurs in the sacrum? a. Less than 5% b. 25% c. 50% 3. The compression of which of the following structures can account for the patient’s symptoms? a. Sacral bone 4. Which of the following imaging features suggests malignant transformation? a. Well-defined, smooth margins
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