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Recommended neck levels to be dissected for occult neck disease based on primary site
| Oral cavity | I–III including IIb |
| Oropharynx | I–III including IIb; recognise significant chance of contralateral disease |
| Supraglottis | IIa–III; IIb and IV can be spared. Contralateral SND not indicated for lateralised tumours |
| Glottis | IIa–III; IIb can be spared. Include IV for T3 and T4 primaries |
| Subgottis | II–IV, VI |
| Hypopharynx | II–IV |
