Combined criteria of CT and sonography for metastatic cervical nodes
| CT criteria | |
| Size criteria | |
| Level of the neck | Short-axis diameter cut-off point |
| I | ≥8 mm |
| II | ≥9 mm |
| III | ≥6 mm |
| IV | ≥7 mm |
| Internal architecture | |
| Central nodal necrosis | |
| Sonographic criteria | |
| Internal architecture | |
| No hilar echo or hilar blood flow | |
| A node is metastatic if it fulfills the CT criteria (size or internal architecture or both) plus the sonographic criteria | |