Table 2.
Accuracy of FDG-PET/CT by Risk Stratification
| Parameter | Primary |
Node |
||
|---|---|---|---|---|
| HR | LR | HR | LR | |
| Sensitivity, % | ||||
| PET/CT | 71.4 | 50.0 | 75.0 | 66.7 |
| CT | 83.3 | 75.0 | 100.0 | 80.0 |
| NPV, % | ||||
| PET/CT | 92.0 | 97.8 | 94.7 | 96.3 |
| CT | 95.7 | 98.0 | 100.0 | 96.7 |
| Specificity, % | ||||
| PET/CT | 100.0 | 82.7 | 84.2 | 57.9 |
| CT | 91.7 | 89.1 | 75.0 | 61.7 |
| PPV, % | ||||
| PET/CT | 100.0 | 16.7 | 75.0 | 14.3 |
| CT | 71.4 | 33.3 | 37.5 | 18.2 |
NOTE. Accuracy parameters are tabulated for FDG-PET/CT and CT alone, divided by primary and nodal sites, for both HR and LR patients.
Abbreviations: FDG, [18F]fluorodeoxyglucose; PET, positron emission tomography; CT, computed tomography; HR, high risk; LR, low risk; NPV, negative predictive value; PPV, positive predictive value.