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Take home messages
• N0 head-and-neck cancer requires elective neck treatment.
• The threshold for elective neck irradiation is ≥5-10% probability of
occult lymph node metastases.
• The 2013 guidelines specify neck node levels.
• Tumor site, histology & N-stage are the principle factors in
selection node levels in the CTV of elective neck.
• De-intensification is a new paradigm in elective neck irradiation.