Abstract
A 57-year-old man presented with a dry cough and renal insufficiency. Serum immunoglobulin G4 (IgG4) level was markedly elevated, and IgG4-related disease was clinically considered. 18F-FDG PET/CT revealed mild uptake in salivary glands and also moderately increased activity in renal parenchyma and prostate. 68Ga-FAPI PET/CT detected prominent and evenly distributed 68Ga-FAPI uptake in the kidney, and the pancreas, salivary gland, and prostate also showed intense activity, consistent with IgG4-related disease involving the kidney, pancreas, salivary gland, and prostate.
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