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Bone cancer. Coloured gamma scan of the skeleton of a 67-year-old woman, showing a bone cancer (here an osteosarcoma) of the right-hand shoulder (green area). The skeleton is seen from the front (left) and from behind (right). Some of the other green areas (lumbar spine, knees) may indicate that the cancer has spread. A gamma scan (also called a scintigram) is obtained by injecting a radioactive isotope (here Tc-99m, Technetium-99m). This tracer material becomes concentrated in the cancerous tissues and is detected by the gamma radiation it emits.
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