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Figure 3d.  FDG uptake in the stomach. (a, b) Axial (a) and coronal (b) FDG PET images show that FDG uptake in the stomach wall (arrows in b) is readily identified in the presence of gaseous distention. (c) Axial FDG PET image shows that FDG uptake in the stomach wall is readily identified in the presence of a contracted stomach that maintains a gastric configuration. (d, e) Axial FDG PET images show that a laterally situated (d) or medially situated (e) contracted stomach (arrow) can appear as a discrete focal abnormality. In both d and e, there is no other region of FDG uptake to suggest a gastric configuration. i in e = injection site, r = normal renal tracer activity. (f) Axial FDG PET image shows that inhomogeneous FDG uptake in the stomach wall (arrow) can simulate an FDG-avid mass. The faint outline of the stomach is discernible (arrowhead), but the stomach is laterally displaced by hepatomegaly. (g) Axial FDG PET image shows that primary gastric carcinoma (arrow) can also produce inhomogeneous FDG uptake, as can gastric lymphoma. (h) Axial FDG PET image shows that focal, inhomogeneous stomach wall uptake can be simulated by a metastatic lesion of the adjacent left adrenal gland (arrow).