TABLE 1:

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