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Weitzer, F; Nazerani, Hooshmand, T; Pernthaler, B; Sorantin, E; Aigner, RM.
Diagnostic value of F-18 FDG PET/CT in fever or inflammation of unknown origin in a large single-center retrospective study.
Sci Rep. 2022; 12(1): 1883
Doi: 10.1038/s41598-022-05911-7
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- Leading authors Med Uni Graz
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Weitzer Friedrich
- Co-authors Med Uni Graz
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Aigner Reingard
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Nazerani-Zemann Tina
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Pernthaler Birgit
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Sorantin Erich
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- Abstract:
- Cause determination is challenging in fever or inflammation of unknown origin (FUO/IUO) despite today's diagnostic modalities. We evaluated the value of F-18 FDG PET/CT in an unselected patient collective. This retrospective nonrandomized single-center study enrolled 300 male and female patients with FUO/IUO. PET/CT findings were compared with final clinical outcomes to determine the sensitivity, specificity, clinical significance, etiological distribution of final diagnoses, impact on treatment, role of white-blood cell count (WBC), and C-reactive protein (CRP). In 54.0% (162/300) PET/CT was the decisive exanimation for establishing the final diagnosis, in 13.3% (40/300) the findings were equivocal and indecisive, in 3.3% (10/300) PET/CT findings were false positive, while in 29.3% (88/300) a normal F-18 FDG pattern was present. Statistical analysis showed a sensitivity of 80.2% and a specificity of 89.8% for the contribution of PET/CT to the final diagnosis. CRP levels and WBC were not associated with PET/CT outcome. PET/CT let to new treatment in 24.0% (72/300), treatment change in 18.0% (54/300), no treatment change in 49.6% (149/300), and in 8.3% (25/300) no data was available. Our study demonstrates the utility of F-18 FDG PET/CT for source finding in FUO/IUO if other diagnostic tools fail.