Secondary (metastatic) bone cancer: false-colour gamma camera scan of a left arm, showing areas of increased uptake of radioactivity in the humerus (upper arm) and ulna (forearm). The increased activity ('hot spots') is represented by the pale blue regions. This is consistent with the sites of bone metastases, given that this particular patient had already received treatment for a primary cancer. This diagnosis would be confirmed by X-ray examination. The radioactive tracer used here was technetium-99m linked to methylene diphosphate (MDP).

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