Conclusions
In conclusion, here we reported a case of anaplastic transformation in metastatic cervical lymph nodes of PTC. Despite being recieved with postoperative radiation therapy, neck skin metastasis and multiple lung metastasis appeared, and the disease rapidly worsened, resulting in an unfortunate outcome. It is important to be aware that papillary thyroid carcinoma could develop anaplastic transformation at metastatic cervical lymph nodes.