Table 2.
Normal physiologic sites with increased FDG uptake
| FDG avid sites | Value, n (%) | Mean maxSUV | Range of maxSUV | Clinical characteristics | ||
|---|---|---|---|---|---|---|
| Age | Causes | |||||
| 1 | Bowel | 23 (33%) | 6.3 ± 3.9 | 2.6-12.4 | 52.0 ± 9.1 | Non-specific |
| 2 | Muscle (lower neck and shoulder) | 20 (29%) | 2.1 ± 0.4 | 1.7-2.6 | 52.9 ± 8.6 | Active contraction in tense patients following surgical intervention |
| 3 | Brown fat | 5 (7%) | 4.1 ± 1.0 | 3.1-5.6 | 43.4 ± 5.1 | Cold-induced thermogenesis |
| 4 | Ovary | 11 (16%) | 5.0 ± 2.1 | 2.7-7.4 | 43.2 ± 6.3 | Late follicular phase during the normal menstrual cycle |
| 5 | Uterus | 7 (10%) | 3.3 ± 0.5 | 2.9-3.6 | 47.0 ± 9.3 | Secretory phase during the normal menstrual cycle |
| 6 | Distal esophagus | 2 (3%) | 3.5 ± 0.4 | 3.7-6.3 | 42.0 ± 8.5 | Non-specific |
| 7 | Breast | 1 (1%) | 2.0 | 29.0 | Lactating breast | |
| 8 | Axillary lymph node | 1 (1%) | 2.1 | 56.0 | Accidental tracer extravasation into tissue | |