鼻咽癌占头颈部肿瘤首位,治疗首选放疗。由于颈部淋巴结引流区域得到充分的放疗,而颏下区不在照射野内,从而使不少患者在放疗后1~2年出现颏下淋巴结肿大。我科2008~2012年收治此类患者,现报告如下。1资料与方法1.1临床资料2008~2012年因鼻咽癌根治性放疗后出现颏 Nasopharyngeal cancer head and neck cancer, radiation treatment of choice. Due to cervical lymphatic drainage area to get adequate radiotherapy, and the submental area is not in the field of exposure, so that many patients in the radiotherapy 1 to 2 years after the occurrence of submental lymph nodes. Our department admitted to such patients from 2008 to 2012, are as follows. 1 Materials and Methods 1.1 Clinical data 2008 ~ 2012 because of nasopharyngeal carcinoma after radical radiotherapy appears chin