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Table 6 Guidelines for contouring neck levels [57]

From: Technical guidelines for head and neck cancer IMRT on behalf of the Italian association of radiation oncology - head and neck working group

  cNo Ipsilateral N+ Comment
Tongue Bilateral I-IV V if N2-3 Excluding IIb
Floor of mouth (well lateralized) Bilateral I-III IV and V if N2-3 Excluding IIb
Hard palate Bilateral Ib, IIa, III, RP Add bilateral Ia, IV, V if N2-3 Excluding IIb
Upper retromolar trigone Bilateral Ib, IIa, III, RP, ipsilateral Ia Add contralateral Ia, bilateral IV and V Excluding IIb
Lower retromolar trigone Ipsilateral I, II, III Add ipsilateral IV, V Excluding IIb
Buccal mucosa Ipsilateral Ib, IIa, III Add ipsilateral Ia, bilateral IV and V Excluding IIb