Positive and negative predictive values of PET examination before PND were 50% and 73%, respectively. None of the patients with PND experienced local or lymph node recurrence.Conclusion: Residual lymph nodes were frequently observed in head and neck carcinomas. Of the imaging tests, PET was sufficient for detecting residual regions. Although PND is a useful tool, related complications were frequently observed. A more accurate detection system is needed to reduce unnecessary neck dissections.

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