Criteria for malignancy in US evaluation of the postradiotherapy neck
| Characteristic | |
|---|---|
| Size | >7–8 mm |
| Shape | Rounded, long-/short-axis ratio <2.0 |
| Hilum | Nonechogenic, infiltrated |
| Outline | Presence of extracapsular extension |
| Necrosis | Cystic or focal defects |
| Color flow | Disorganized, subcapsular flow |
| History | Change from prior exam |