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  • Title: 18F-FDG-PET/CT in unexplained elevated inflammatory markers. Joining entities.
    Author: Bouter C, Braune I, Meller B, Sahlmann C, Ritter C, Meller J.
    Journal: Nuklearmedizin; 2016 Dec 06; 55(6):242-249. PubMed ID: 27617327.
    Abstract:
    UNLABELLED: The diagnostic strategy in patients with fever or inflammation of unknown origin remains a major clinical challenge. The aim of this study was to evaluate the role of 18F-FDG-PET/CT in patients with unexplained elevated C-reactive protein with or without fever. Contribution of 18F-FDG-PET/CT to the final diagnosis was evaluated. In addition we determined whether a differentiation between patients with or without fever is clinically reasonable. PATIENTS, METHODS: We retrospectively analysed 72 consecutive patients with unexplained elevated C-reactive protein levels (above 8mg/l) that underwent 18F-FDG-PET/CT in our facility between 10/2009 and 11/2012. 18F-FDG-PET/CT was considered a so-called diagnostic scan when results decisively led to a final diagnosis and adequate therapy with a response of symptoms was initiated due to the PET/CT result. RESULTS: In 60/72 patients (83%) a final diagnosis was established. Diagnoses included infections (58%), non-infectious inflammatory diseases (29%) and malignancies (8%). 18F-FDG-PET/CT was true positive in 47 cases (65%) and the diagnostic scan in 29 patients (40%). Sensitivity of 18F-FDG-PET/CT was 81% and specificity was 86%. Diagnostics, final diagnoses, 18F-FDG-PET/CT results, SUVmax, C-reactive protein levels and the diagnostic scan did not differ significantly between patients with fever and patients without fever. CONCLUSION: 18F-FDG-PET/CT is a useful method in the diagnostic workup of patients with inflammation of unknown origin. In our series there was no significant difference between patients with or without fever. Regarding 18F-FDG-PET/CT-imaging inflammation of unknown origin and unexplained fever can be joined to one entity.
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