CASE 148 History: A 70-year-old woman presents with a history of back pain and left leg numbness. 1. What should be included in the differential diagnosis? (Choose all that apply.) b. Lymphoma c. Schwannoma d. Pigmented villonodular synovitis (PVNS) 2. What is the most common site of involvement of PVNS in the spinal axis? c. Lumbar spine d. Sacrum 3. Which part of the vertebra is most commonly involved in PVNS? b. Facet joint c. Lamina 4. Which of the following statements regarding imaging findings in PVNS is true? a. Postcontrast MRI images rarely demonstrate enhancement.
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