The role of (18)F-fluorodeoxyglucose positron emission tomography in the assessment of disease activity of adult-onset Still’s disease

BACKGROUND/AIMS: (18)F-fluorodeoxyglucose positron emission tomography/computed tomography ((18)F-FDG PET/CT) has been suggested as a reliable imaging technique for monitoring of disease activity in patients with adult-onset Still’s disease (AOSD). Therefore, we investigated the clinical significance of (18)F-FDG PET/CT in Korean AOSD patients. METHODS: Thirteen AOSD patients were included in the study. The PET/CT images were evaluated with visual and semiquantitative method using standardized uptake values (SUVs). RESULTS: The presence of increased (18)F-FDG uptake was noted in 90% of clinically active AOSD patients. (18)F-FDG uptake was located in the lymph node, spleen, and bone marrow. Visual grade and SUV intensity of lymph node was significantly correlated with the systemic score of AOSD. Visual grade of spleen was significantly correlated with the systemic score, erythrocyte sedimentation rate (ESR), and ferritin. Additionally, visual grade and SUV intensity of bone marrow was significantly correlated with the systemic score, ESR, leukocyte, and neutrophil. CONCLUSIONS: Visual grade and SUV intensity of lymph node, spleen, and bone marrow on (18)F-FDG PET/CT scan showed significant correlations with known disease activity markers. The data suggest that (18)F-FDG PET/CT scan may be a useful imaging technique for evaluation of disease activity in AOSD patients.