Table 2.
Comparison of SUV-related and texture parameters and summed score between low- and high-risk thymic epithelial tumours
| Index | Low-risk tumours (n = 11) | High-risk tumours (n = 23) | p value | ||||
| Median | IQR | Range | Median | IQR | Range | ||
| SUVmax | 3.9 | 3.6–5.0 | 2.8–14.3 | 6.4 | 4.2–9.5 | 3.1–10.7 | 0.022 |
| SUVmean | 2.9 | 2.7–3.1 | 2.6–9.1 | 3.0 | 3.0–4.7 | 2.6–6.3 | 0.034 |
| MTV (cm3) | 35.6 | 21.8–59.0 | 15.9–168.8 | 54.6 | 33.2–92.8 | 13.4–530.2 | 0.11 |
| TLG | 103.2 | 59.5–182.2 | 45.8–577.9 | 220.0 | 117.9–390.5 | 50.9–2863.1 | 0.087 |
| Entropy | 7.07 | 6.96–7.17 | 6.58–7.31 | 7.29 | 6.90–7.44 | 6.64–7.65 | 0.038 |
| Homogeneity | 0.212 | 0.202–0.221 | 0.194–0.264 | 0.197 | 0.174–0.225 | 0.134–0.264 | 0.16 |
| Dissimilarity | 8.12 | 7.23–8.38 | 5.61–9.21 | 8.94 | 8.00–10.85 | 5.92–14.39 | 0.053 |
| IV | 20.23 | 12.75–28.34 | 5.00–45.88 | 37.33 | 18.78–59.54 | 9.47–155.32 | 0.041 |
| SZV | 337.76 | 236.61–405.72 | 134.55–581.37 | 425.50 | 363.27–757.76 | 146.01–2778.96 | 0.045 |
| ZP | 0.27 | 0.23–0.30 | 0.10–0.41 | 0.20 | 0.14–0.28 | 0.05–0.44 | 0.053 |
| Summed score | 1 | 0–1 | 0–2 | 4 | 3–4 | 2–5 | <0.001 |
IQR, interquartile ranges; IV, intensity variability; MTV, metabolic tumour volume; SUV, standardized uptake value; SZV, size-zone variability; TLG, total lesion glycolysis; ZP, zone percentage.
p-values for comparison between low- and high-risk tumours (Mann–Whitney U test).