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

Table 9 Guidelines for contouring bilateral neck levels (negative on imaging)

Side	Level	Risk	Remarks
Bilateral	Retropharyngeal, II, III, Va	High
	IV, Vb	Low	Higher risk when level III is clinically involved
	IB	Very Low	Omit or include only in case of neck node positivity

ISSN: 1748-717X