棕色脂肪摄取18F-FDG的影像学表现（附6例报告）

目的：分析和探讨棕色脂肪（BAT）摄取18F-FDG的影像学图像特点。方法：回顾性分析2005年11月-2007年2月间所有。SF-FDGPET／CT显像病例，根据判断标准选择BAT显影病例。结果：493例中有6例BAT显影（6／493，1．2％），男1例，女5例；BAT显影以对称性分布在颈部、锁骨上、腋下和胸椎旁为主，SUVmax在1．4～9．2之间；5例患者（5，6，83．3％）BAT于寒冷季节显影：1例患者两次显像中一次出现BAT显影，而另一次未出现；所有病例延迟显像发现BAT分布部位及放射性浓聚程度无明显变化，其中4例体重指数（BMI）较低。结论：BAT摄取18F—FDG的显影分布形式多种多样，PET诊断医师应熟悉和掌握BAT图像特点，以降低对BAT显影的假阳性诊断率。

The imaging characteristics of 18F-FDG accumulated by brown adipose fat(report of six cases)

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.