Radiologic Criteria of Retropharyngeal Lymph Node Metastasis in Nasopharyngeal Carcinoma Treated with Radiation Therapy

Purpose To determine the appropriate radiologic criteria of metastatic retropharyngeal lymph nodes (RLNs) in patients with nasopharyngeal carcinoma (NPC). Materials and Methods After institutional review board approval and informed consent, 303 consecutive NPC patients treated with definitive radiation therapy were examined after completion of therapy. RLNs were classified as metastatic on the basis of the results of magnetic resonance (MR)...