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Figure 8a. Cholecystitis in a 47-year-old man with non-Hodgkin lymphoma who was undergoing chemotherapy. (a) Axial PET scan shows FDG accumulation in the gallbladder (arrow). The accumulation in the retroperitoneum (arrowheads) represents lymphoma. (b) Abdominal CT scan shows a gallstone and a fluid collection adjacent to the gallbladder (arrow) as well as retroperitoneal lymphadenopathies (arrowheads).