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First published online August 20, 2007
British Journal of Radiology (2007) 80, 750-756
© 2007 British Institute of Radiology
doi: 10.1259/bjr/53719785
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Uptake characteristics of fluorodeoxyglucose (FDG) in deep fibromatosis and abdominal desmoids: potential clinical role of FDG-PET in the management

S Basu, MBBS, DRM, DNB 1 N Nair, MD 1 and S Banavali, MD 2

1 Radiation Medicine Centre (BARC), 2 Department of Medical Oncology, TATA Memorial Hospital, Parel, Bombay 400 012, India


Figure 1
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  		Figure 1. Upper panel: pretreatment whole-body FDG-PET showing a large area of heterogeneous FDG uptake in the right gluteal (SUVmax 4.68) and right upper thigh (SUVmax 3.73) regions corresponding to the clinically palpable and CT-described soft-tissue masses. Lower panel: follow-up FDG-PET for treatment monitoring showed a decrease in the relatively intense fair-sized focus at the superomedial aspect in the gluteus maximus muscle (the SUVmax reduced from 4.7 to 1.6, i.e. a reduction of 65.17%), whereas the right upper thigh focus revealed a marginal increase in SUV (from 3.7 to 3.8).

 

Figure 2
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  		Figure 2. Upper panel: pretreatment FDG-PET showing large area of heterogeneous FDG uptake in the right thigh corresponding to the tumour described in the MRI of the right thigh. The SUVmax of three areas (arrows) which appeared relatively intense visually were 2.8, 2.4 and 2.4 (from proximal to distal). Lower panel: post-therapy FDG-PET registered a reduction in the FDG uptake. The SUVmax of the previous three prominent foci in the post-therapy FDG-PET (ROI drawn over the same area as in the pre-therapy FDG-PET) were 2.30 (reduction of 17.26%), 1.80 (reduction of 25%) and 1.7 (reduction of 26.89%).

 

Figure 3
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  		Figure 3. FDG-PET showing a large focus of mild to moderately enhanced FDG uptake corresponding to the clinically discernible large mass. The avidity of uptake is more at its superior aspect (arrow). Another focus of smaller size and relatively lower FDG uptake is observed below the above focus. The SUVmax values obtained were 2.8 and 2.2, respectively.

 

Figure 4
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  		Figure 4. Upper panel: whole-body FDG-PET demonstrating moderately enhanced homogeneous uptake in both the lesions; the SUVmax of the right gluteal mass was 3.6 and that of the abdominal desmoid was also 3.6. Lower panel: a delayed limited PET (obtained at 2.5 h after injection of FDG) of the right gluteal region registered an increase in the SUVmax to 4.4 (increase of 24.71%).

 

Figure 5
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  		Figure 5. Upper panel: FDG-PET showing low-grade FDG uptake with a few tiny foci of relatively intense uptake interspersed within. The SUVmax calculated by drawing the ROI over the three most prominent foci were 3.8, 3 and 2.6. Lower panel: delayed limited PET (obtained at 2.5 h after injection of FDG) of the abdomen demonstrating the foci to be more prominent; the SUVmax values being 4 (increase of 6.93%), 3.6 (increase of 19.80%) and 3.3 (increase of 25.85%), respectively.

 




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