title: Incidental diagnosis of thrombus within an aneurysm on 18F-FDG PET/CT: frequency in 926 patients.
abstract: Our objective was to evaluate the incidence of aneurysm and the frequency of thrombus within an aneurysm on unenhanced (18)F-FDG PET/CT studies.
  
  
  METHODS
  We reviewed 1,540 PET/CT scans from 926 patients. A log recorded whether each case of aneurysm had a suspected thrombus. The maximal standardized uptake value of the patent vessel was compared with the thrombus. Findings were confirmed using all available follow-up data.
  
  
  RESULTS
  Aneurysm was found incidentally in 16 (1.7%) of the 926 patients, with 15 occurring in the abdominal aorta and 1 in the internal jugular vein. Seven of these 16 patients had shown suggestions of thrombus on unenhanced PET/CT, and in all 7, thrombi were confirmed on contrast-enhanced CT.
  
  
  CONCLUSIONS
  In 1.7% of patients, aneurysm was found incidentally on PET/CT, and thrombus was present in 44% of these cases.
authors.affiliation: Division of Nuclear Medicine, Department of Radiology, Saint Louis University, Saint Louis, Missouri 63110, USA.
authors.forename: Razi
authors.initials: R
authors.lastname: Muzaffar
authors.forename: Ganesh
authors.initials: G
authors.lastname: Kudva
authors.forename: Nghi C
authors.initials: NC
authors.lastname: Nguyen
authors.forename: Medhat M
authors.initials: MM
authors.lastname: Osman
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000783:Aneurysm / Q000000981:diagnostic imaging; D017544:Aortic Aneurysm, Abdominal / Q000000981:diagnostic imaging* / Q000453:epidemiology; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D007091:Image Processing, Computer-Assisted; D033162:Incidental Findings; D007601:Jugular Veins / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000150:complications; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals; D013927:Thrombosis / Q000000981:diagnostic imaging* / Q000453:epidemiology
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18