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Fusion 18F-FDG PET/CT axial slices performed due to suspicion of IgG4-RSD recurrence with normal levels of immunoglobulins. There is increased 18F-FDG uptake in the parotids glands (blue arrows)
18F-FDG PET/CT: 2-[18F]-fluoro-2-deoxy-D-glucose–positron emission tomography/computed tomography
