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18F-choline-positron-emission-tomography/computed tomography scans. (A) From September 2007, prior to immunotherapy. Multiple focal tracer enhancements in the spine, 5th right rib and pelvis. (B) From March 2008, following immunotherapy. Distinct regression of skeletal metastases, no more focal enhancement observable. Mild diffuse tracer enhancement in thoracic spine, representing low remaining metabolic activity.
