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Secondary cancer. Coloured composite computed tomography (CT) and positron emission tomography (PET) scans through the abdomen of a patient with a metastatic tumour (round, lower centre) in one of their lumbar (lower) vertebra. A radioactive tracer, injected into the patient's bloodstream, has been taken up by the tumour. 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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