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Positron-emission tomography (PET) imaging with 18fluorodeoxyglucose (FDG) of a patient with lymphoma. The mediastinal nodes (purple arrow) and supraclavicular nodes (green arrows) show high uptake of FDG, indicating that tumors in these nodes have high levels of glucose metabolism. The bladder (yellow arrow) also has high activity because of excretion of the radionuclide. (Reprinted from Gatenby and Gillies 2004, with permission from Macmillan Publishers.)
