RT Journal Article SR Electronic T1 Incidental Diagnosis of Thrombus Within an Aneurysm on 18F-FDG PET/CT: Frequency in 926 Patients JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 1408 OP 1411 DO 10.2967/jnumed.111.091264 VO 52 IS 9 A1 Muzaffar, Razi A1 Kudva, Ganesh A1 Nguyen, Nghi C. A1 Osman, Medhat M. YR 2011 UL http://jnm.snmjournals.org/content/52/9/1408.abstract AB Our objective was to evaluate the incidence of aneurysm and the frequency of thrombus within an aneurysm on unenhanced 18F-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. Conclusion: In 1.7% of patients, aneurysm was found incidentally on PET/CT, and thrombus was present in 44% of these cases.