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Secondary cancer. Positron emission tomography (PET) scans of sections through the abdomen of a patient with metastatic tumours in ganglion cells of the nervous system. 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 ovarian cancer. Once a cancer has spread the prognosis is poor.
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