Figure 1.

18F-FDG PET/CT in a case of AOSD with a monocyclic course. A 63-year-old woman presented with a fever up to 39.6 °C, asthenia, polyarthralgia, sore throat, and skin rash. Arrowheads show ¹⁸F-FDG accumulation in the spleen (A,C,F: SUV_max = 7.0) and in the bone marrow (D: SUV_max = 5.4). Arrows show 18F-FDG accumulation in multiple lymph nodes (F: SUV_max = 12.0). Moderate 18F-FDG accumulation is visible in the elbows and in the wrists. The lymph node with the highest SUV_max (B,E) was biopsied, and histological examination showed reactive hyperplasia without any signs of malignancy. The patient improved after aspirin treatment. Relapse was also treated with aspirin. At three months, there was no sign of disease activity, and no lymphadenopathy was seen on whole-body CT.