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Table 11 guidelines for contouring ipsilateral and contralateral neck levels negative at imaging

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

Side Level Risk   Remarks
Ipsilateral Ib Low CTV3 Higher risk for soft palate/oral cavity involvement or multiple positive neck levels-CTV2
  II-III High CTV2 Lower risk when the whole neck is negative (cN0)-CTV3
  IV Low CTV3 Higher risk when level III is clinically involved- CTV2
  V Very low CTV3 or omit  
Contralateral IB Very low Omit Higher if the contralateral II-III lymph node level is clinically positive or the soft palate is involved
  II-III Low CTV3 Higher risk if the contralateral level IB is clinically positive
  IV Low CTV3 Higher risk when level III is clinically involved
  V Very low Omit Omit unless suspicious nodes are found