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The Value of 18F-FDG PET/Contrast-Enhanced CT in Detection of Tumor Thrombus.
MedLine Citation:
PMID:  23334142     Owner:  NLM     Status:  In-Data-Review    
PURPOSE: The differentiation between tumor and bland thromboses is important as the management differs. Retrospectively, we aim to evaluate the utility of FDG PET in detecting and differentiating tumor from bland thromboses and if FDG PET provides additional value to contrast-enhanced CT for tumor thrombus detection.
PATIENTS AND METHODS: Twenty-four sites of venous thromboembolism, detected on PET/CT, were retrospectively reviewed. Classification of type of thrombosis was based on histology and radiological follow-up. We evaluated the presence of contrast-enhanced CT findings that were suggestive of tumor thrombosis; sign of invasion, neovascularity, and enhancement. Metabolic activity by means of SUVmax was measured by drawing ROI at the site of thrombosis. Mann-Whitney U test was used to compare the mean SUVmax between thromboses and internal references. We used ROC analysis to identify the optimal cutoff value of SUVmax for detection of tumor thrombosis.
RESULTS: Twenty-four sites of venous thromboembolism were identified in 15 patients. All tumor thromboses demonstrated at least 1 positive sign on contrast-enhanced CT, whereas 33% of bland thromboses had the same finding. The difference between tumor and bland thrombus SUVmax was statistically significant (P < 0.005). On ROC analysis, a cutoff of SUVmax 2.25 (sensitivity, 78%; specificity, 100%) was suggested to differentiate tumor from bland thrombosis.
CONCLUSION: PET/CT is able to differentiate tumor from bland thrombosis, with an optimal cutoff value of SUVmax 2.25. The metabolic information increases the diagnostic accuracy of tumor thrombus and is a useful adjunct to the described features on contrast-enhanced CT.
Elaine Yuen Phin Lee; Pek-Lan Khong
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Clinical nuclear medicine     Volume:  38     ISSN:  1536-0229     ISO Abbreviation:  Clin Nucl Med     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7611109     Medline TA:  Clin Nucl Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e60-5     Citation Subset:  IM    
From the Department of Diagnostic Radiology, Queen Mary Hospital, University of Hong Kong, Pokfulam, Hong Kong.
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