５％～３０％的头颈部癌可以发生第二原发性肿瘤，常位于上呼吸消化道、肺和食管，仅少数第二原发性肿瘤在头颈部首发肿瘤确诊时得以同时发现。据文献报道，与头颈部首发癌同时发生的肺部第二原发癌发生率为０．５～３．８／，常与口腔癌和喉癌同时发生。因此，许多耳鼻咽喉科 A second primary tumor can occur in 5% to 30% of head and neck cancers. It is often located in the upper gastrointestinal tract, lungs, and esophagus. Only a small number of second primary tumors can be found when the first head and neck tumor is diagnosed. According to reports in the literature, the incidence of the second primary lung cancer occurring at the same time as the first cancer of the head and neck is 0.5 to 3.8/, which often coincides with oral cancer and laryngeal cancer. So many otolaryngology