FIGURE 1. Sixty-year-old man with rising CA19-9 level and history of pancreatic cancer after therapy was evaluated by ¹⁸F-FDG PET for suspected tumor. Patient had ingested barium for upper gastrointestinal study 1 week before PET/CT study without additional contrast being administered. CT (A; arrow) showed residual, dense barium in distended stomach consistent with high-grade gastric outlet stenosis. CT attenuation-corrected PET emission images (B; arrow) showed area of increased activity in stomach corresponding to barium retention on CT (max CT Hounsfield units = 3,071). However, no increased uptake was seen in gastric lumen in nonattenuation-corrected images (C; arrow). SUV_LEAN for high-activity gastric artifact was 5.31 maximum and 3.81 mean.

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