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Figure 7a. GIST in a 67-year-old man. The mass was incidentally detected at upper endoscopy performed to evaluate for guaiac-positive stool. (a) CT scan shows a proximal soft-tissue gastric mass (arrow). (b, c) Axial fused PET-CT image (b) and PET scan (c) demonstrate increased FDG uptake (arrow), a finding that corresponds to the mass seen at CT. Biopsy of the mass revealed a GIST.