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Coronal PET maximum intensity projection (MIP) image (a) displaying foci of increased radiotracer uptake bilaterally in the neck in a patient with treated DLBSL. The corresponding coronal CT (b) and fused FDG-PET/CT (c) demonstrate no abnormality and the areas with increased FDG uptake correspond to regions of fat density (arrows). This is the characteristic appearance of hypermetabolic brown fat on FDG-PET/CT.
