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Related Concept Videos

Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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18F-FDG-PET/CT in unexplained elevated inflammatory markers. Joining entities.

Caroline Bouter1, Isabell Braune, Birgit Meller

  • 1Caroline Bouter, Department of Nuclear Medicine, Georg-August-University Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany,

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Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography (18F-FDG-PET/CT) aids in diagnosing inflammation of unknown origin. This imaging technique is effective regardless of whether patients present with fever, suggesting a unified diagnostic approach.

Keywords:
18F-FDG-PET/CTC-reactive proteinFeverinflammation of unknown origin

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Area of Science:

  • Nuclear Medicine
  • Radiology
  • Internal Medicine

Background:

  • Diagnosing fever or inflammation of unknown origin (FUO) presents significant clinical challenges.
  • Elevated C-reactive protein (CRP) levels, with or without fever, indicate underlying inflammation or disease.

Purpose of the Study:

  • To assess the utility of 18F-FDG-PET/CT in patients with unexplained elevated CRP levels.
  • To determine if fever presence impacts the diagnostic value of 18F-FDG-PET/CT.
  • To evaluate the contribution of 18F-FDG-PET/CT to establishing a final diagnosis.

Main Methods:

  • Retrospective analysis of 72 patients with unexplained elevated CRP (>8mg/l) who underwent 18F-FDG-PET/CT.
  • Defined 18F-FDG-PET/CT as a 'diagnostic scan' if it led to a definitive diagnosis and successful therapy.
  • Compared diagnostic outcomes between patients with and without fever.

Main Results:

  • A final diagnosis was achieved in 83% of patients, including infections (58%), inflammatory diseases (29%), and malignancies (8%).
  • 18F-FDG-PET/CT demonstrated 81% sensitivity and 86% specificity, acting as a diagnostic scan in 40% of cases.
  • No significant differences in diagnostic yield or outcomes were observed between febrile and afebrile patients.

Conclusions:

  • 18F-FDG-PET/CT is a valuable tool for investigating inflammation of unknown origin.
  • The presence or absence of fever did not significantly alter the effectiveness of 18F-FDG-PET/CT.
  • Inflammation of unknown origin and unexplained fever can be considered a single diagnostic entity when utilizing 18F-FDG-PET/CT.