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Figure 10xy.  Irregular myocardial FDG uptake in a patient who had fasted for 12 hours before FDG injection. Axial FDG PET images of the chest (shown from superior [top left] to inferior [bottom right]) show the outlines of the left and right ventricles. There are discrete foci of intense FDG activity (arrows), which could be mistaken for mediastinal lymph nodes at the base of the heart.