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  • Title: Fever of unknown origin: a retrospective study of 52 cases with evaluation of the diagnostic utility of FDG-PET/CT.
    Author: Pedersen TI, Roed C, Knudsen LS, Loft A, Skinhoj P, Nielsen SD.
    Journal: Scand J Infect Dis; 2012 Jan; 44(1):18-23. PubMed ID: 21888563.
    Abstract:
    OBJECTIVES: Fever of unknown origin (FUO) is dynamic in its origin and will be an ongoing challenge to the clinician because of shifting disease epidemiology. Here we present a series of patients with classical FUO admitted to an infectious diseases department during a 5-y period, with an emphasis on the diagnostic utility of ¹⁸F-fluorodeoxyglucose positron emission tomography (PET)/computed tomography (CT) in present-day cases of FUO. METHODS: Patient records were reviewed retrospectively. RESULTS: A final diagnosis was achieved for 31 of the 52 cases (60%). The final diagnoses of these 31 cases and their distribution in the respective diagnostic categories were: infections 32% (10/31), non-infectious inflammatory disease 55% (17/31), and malignancy 13% (4/31). In our study PET/CT successfully identified an infectious, inflammatory, or neoplastic cause of fever in 10 of the 22 patients (45%) who underwent this scan. CONCLUSIONS: During the past decade the proportion of non-infectious inflammatory diseases in FUO series has increased. Based on our findings we recommend: (1) a PET/CT scan be performed early in the diagnostic work-up of patients with FUO, and (2) restraint in performing invasive procedures in patients with FUO in whom no cause of fever has been determined during diagnostic work-up.
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