CASE 93 History: A 63-year-old woman presents with lower back pain. 1. What should be included in the differential diagnosis for the imaging findings presented? (Choose all that apply.) a. Chordoma b. Metastasis c. Plasmacytoma d. Schwannoma e. Ependymoma 2. What is the most common location of chordomas? a. Clivus c. Lumbar spine 3. Among all primary tumors of the sacrum, what is the frequency of chordoma? a. 20% b. 40% c. 60% d. 80%
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