18F-fluorodeoxyglucose positron emission tomography/ computed tomography in the diagnosis of suspected paraneoplastic syndromes: A retrospective analysis.

• Type of Material: Article
• Authors: Richard Bresler, Royal College of Surgeons in Ireland; Harry Schroeder, Emory University; David Z. Chow, Massachusetts General Hospital; Ruth Lim, Massachusetts General Hospital
• Language: English
• Date: 2020-04
• Publisher: World Journal of Nuclear Medicine
• Publication Version: Final Published Version
• Copyright Statement: © 2020 World Journal of Nuclear Medicine
• License: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
• Final Published Version (URL): http://dx.doi.org/10.4103/wjnm.WJNM_48_19
• Title of Journal or Parent Work: World Journal of Nuclear Medicine
• Volume: 19
• Issue: 2
• Start Page: 124
• End Page: 130
• Grant/Funding Information: Nil.
• Keywords: paraneoplastic syndrome; positron emission tomography/computed tomography; Oncology
• Research Categories: Biology, Microbiology; Health Sciences, Oncology

Abstract

Paraneoplastic syndromes are a rare clinical presentation of tumor thought to affect 0.01% of patients with cancer. Paraneoplastic syndromes present a diagnostic challenge as a wide variety of signs and symptoms may appear. This study examines the use of 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) as a diagnostic imaging tool for detecting tumor in suspected paraneoplastic syndrome cases. This single-center retrospective study included patients with suspected paraneoplastic syndrome who underwent whole-body 18F-FDG PET/CT scan between December 2005 and December 2016. Associated clinical data were gathered via electronic chart review. Patient records were reviewed for age, sex, clinical signs and symptoms, ancillary diagnostic procedures, date of diagnosis, and follow-up time. Ninety-nine patients met inclusion criteria for this study. Mean follow-up period was 1.8 years. Cancer prevalence was 12.1%. The 18F-FDG PET/CT results are as follows: 10 true positives, 5 false positives, 82 true negatives, and 2 false negatives. The diagnostic values are as follows: sensitivity 83.3%, specificity 94.3%, positive predictive value 66.7%, and negative predictive value (NPV) 97.6%. The high NPV in our study supports the effectiveness of 18F-FDG PET/CT to rule out tumor in suspected paraneoplastic syndrome. Future research aims to analyze which patients with suspected paraneoplastic syndrome would benefit most from 18F-FDG PET/CT.