Performance of combined criteria of helical CT and Doppler sonography for 17 patients with recurrent cancer in the cervical lymph nodes
| Lymph nodes (n=255) | |||
| No. of metastasis | 30 | ||
| No. of reactive nodes | 225 | ||
| Combination | CT | Sonography | |
| No. of false positive nodes | 0 | 5 | 13 |
| No. of false negative nodes | 2 | 3 | 2 |
| Sensitivity (%) | 87 | 83 | 87 |
| Specificity (%) | 100 | 97 | 94 |
| Positive predictive value (%) | 100 | 87 | 67 |
| Negative predictive value (%) | 99 | 99 | 99 |