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ISM / SCIENCE PHOTO LIBRARY ISM / SCIENCE PHOTO LIBRARY
Secondary cancer. Computed tomography (CT, left) and positron emission tomography (PET, centre) scans of a patient with metastatic tumours (pink) in their spine. The two scans have been coloured and combined at right. A radioactive tracer, injected into the patient's bloodstream, has been taken up by the tumours. A metastatic cancer is a secondary cancer that has spread (metastasised) from the site of the original cancer, which in this case was lung cancer. Spread to the spine is common. Once a cancer has spread the prognosis is poor.
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