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| The imaging characteristics of 18F-FDG accumulated by brown adipose fat(report of six cases) |
| LI Jian-ming, LIU Ying, XIN Jun, WANG Xiao-ming, ZHAI Wei, LIU Chang-ping |
| Shengjing Hospital, China Medical University, Shenyang 110004, China |
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Abstract Objective: To analyze and discuss the characteristic pattern of 18F-FDG uptake in brown adipose tissue(BAT). Methods: All the 18F-FDG PET/CT scans between Nov. 2005 and Jan. 2007 were reviewed, and the patients with BAT 18F-FDG accumulation were selected according to criteria. Results: Six patients whose BAT accumulated 18F-FDG were qualified among 493 cases(6/493, 1.2%), one man and five women. The distribution of BAT was symmetrically situated in the neck, the supraclavicalar area, axillary area, paravertebral thoracic area. The SUVmax in BAT ranged from 1.4 to 9.2. Five cases(5/6, 83.3%) presented 18F-FDG accumulated in BAT in cold season. In one patient who underwent PET/CT scans twice, BAT was visualized once, but not for the other time. There was no distinct difference for the distribution and radioactive intensity of BAT between early scan and delay scan among six cases. The BMIs of 4 cases were in the lower level. Conclusion: There are multiform patterns of 18F-FDG accumulated in BAT, which should be familiar with and mastered by the PET diagnostician in order to decrease the rate of false positive diagnosis.
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Received: 11 July 2007
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2008, Vol. 19 
