title: Concurrent Low Brain and High Liver Uptake on FDG PET Are Associated with Cardiovascular Risk Factors.
abstract: Concurrent low brain and high liver uptake are sometimes observed on fluorine-18-labeled fluoro-2-deoxy-D-glucose (FDG) positron emission tomography (PET). We investigated the potential clinical significance of this uptake pattern related to metabolic syndrome (MS).
  
  
  
  We retrospectively reviewed data from 264 consecutive males who had undergone general health check-ups, including FDG PET/CT scans. After an overnight fast, the men had their peripheral blood drawn and the levels of various laboratory parameters measured; an FDG PET/CT scan was performed on the same day. We measured the maximum standardized uptake values of the brain and liver from regions of interest manually placed over the frontal cortex at the level of the centrum semiovale and the right lobe of the liver parenchyma, respectively.
  
  
  
  Fasting blood glucose (FBG; odds ratio [OR] = 1.063,p< 0.001) and glycated hemoglobin (HbA1c; OR = 3.634,p= 0.010) were the strongest predictive factors for low brain FDG uptake, whereas waist circumference (OR = 1.200,p< 0.001) and γ-glutamyl transpeptidase (OR = 1.012,p= 0.001) were the strongest predictive factors for high liver uptake. Eleven subjects (4.2%) showed concurrent low brain and high liver FDG uptake, and all but one of these subjects (90.9%) had MS. Systolic blood pressure, waist circumference, FBG, triglyceride, alanine aminotransferase, insulin resistance (measured by homeostasis model assessment), insulin, HbA1c, and body mass index were higher in subjects with this FDG uptake pattern than in those without (all,p< 0.001).
  
  
  
  Concurrent low brain and high liver FDG uptake were closely associated with MS. Moreover, subjects with this pattern had higher values for various cardiovascular risk factors than did those without.
authors.affiliation: Department of Nuclear Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon 51353, Korea.
authors.forename: Hyun-Yeol
authors.initials: HY
authors.lastname: Nam
authors.affiliation: Department of Nuclear Medicine, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan 49267, Korea.
authors.forename: Sungmin
authors.initials: S
authors.lastname: Jun
authors.affiliation: Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan 49241, Korea.
authors.forename: Kyoungjune
authors.initials: K
authors.lastname: Pak
authors.affiliation: Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan 49241, Korea.
authors.forename: In Joo
authors.initials: IJ
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D001786:Blood Glucose / Q000032:analysis; D001921:Brain / Q000378:metabolism*; D002318:Cardiovascular Diseases / Q000175:diagnosis / Q000209:etiology; D019788:Fluorodeoxyglucose F18 / Q000737:chemistry; D006442:Glycated Hemoglobin / Q000032:analysis; D006801:Humans; D008099:Liver / Q000378:metabolism*; D016015:Logistic Models; D008297:Male; D024821:Metabolic Syndrome / Q000150:complications / Q000473:pathology; D008875:Middle Aged; D016017:Odds Ratio; D000072078:Positron Emission Tomography Computed Tomography; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals / Q000737:chemistry / Q000378:metabolism*; D012189:Retrospective Studies; D012307:Risk Factors; D055105:Waist Circumference; D005723:gamma-Glutamyltransferase / Q000032:analysis
chemical_list: D001786:Blood Glucose; D019788:Fluorodeoxyglucose F18; D006442:Glycated Hemoglobin; D019275:Radiopharmaceuticals; D005723:gamma-Glutamyltransferase; C517652:hemoglobin A1c protein, human
keywords: Brain; Cardiovascular risk factor; FDG; Liver; PET