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This case shows the effects of activation of brown fat in a nervous patient. (a) An anterior projection image shows abnormal activity extending from the neck through the supraclavicular and axillary regions, the anterior mediastinum, the paraspinal regions, and the retrocrural and perirenal regions. (b) Transaxial PET, (c) CT, and (d) fusion images localize the activity to fatty tissue rather than to lymph nodes or tumor masses.
