甲状腺髓样癌（MTC）源自甲状腺C细胞，生成降钙素和癌胚抗原（CEA）。大部分浸润性MTC在确诊时已有区域性淋巴结转移，甲状腺切除后降钙素持续升高，颈淋巴结复发率高，这一资料提示在第一次手术时应同时行彻底的淋巴结清扫术，甲状腺切除术后降钙素持续升高时应再次行颈淋巴 Medullary thyroid carcinoma (MTC) is derived from thyroid C cells and produces calcitonin and carcinoembryonic antigen (CEA). Most invasive MTCs have regional lymph node metastasis at the time of diagnosis, with continued elevation of calcitonin after thyroidectomy, and a high rate of recurrence of cervical lymph nodes. This data suggests that lymph node dissection should be performed at the same time during the first operation. Continue to raise the level of calcitonin after thyroidectomy