Secondary cancer. Computed tomography (CT, left) and positron emission tomography (PET, centre) scans of a patient with metastatic tumours (red) in the liver, lungs, intestines and ganglion cells of the nervous system. At right the scans are combined and coloured. 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 thyroid cancer. Once a cancer has spread the prognosis is poor.
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