A 69-year-old man presents with 2 months of progressive low back pain that is worse at night and is not relieved by rest. He has lost 6 kg unintentionally and has a history of treated prostate cancer. Examination shows focal percussion tenderness over the lumbar spine but no limb weakness or sphincter disturbance. Which imaging investigation is the most appropriate next step?
Keep going — a set of ten like this one, one at a time.
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