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Secondary bone cancer. Coloured gamma scans of the skeleton of a man with secondary bone cancer (green areas). The skeleton is seen from the front (left) and from behind (right). The cancer has spread to the spine from a cancer of the prostate gland. Cancer that spreads from its original site is referred to as secondary cancer, and the cancer is said to have metastasised. The prognosis is poor. A gamma scan (also called a scintigram) is obtained by injecting a radioactive isotope (here TC-99m, or Technetium-99m). This tracer material becomes concentrated in the cancerous tissues and is detected by the gamma radiation it emits.
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