甲状腺癌是所有内分泌器官中恶性肿瘤发病率最高的。据国际癌症学会资料统计,各国甲状腺癌的发病率逐年增加,病人的总体预后有很大改善,这在很大程度上是因为发现了更多的微小癌。据报道微小癌占甲状腺癌的比率很高,达20%~35%左右[1]。甲状腺微小癌的定义为直径小于1cm的癌[2], Thyroid cancer is the highest incidence of all malignant tumors in endocrine organs. According to statistics from the International Agency for Research on Cancer, the incidence of thyroid cancer in various countries is increasing year by year, and the overall prognosis of patients has been greatly improved, which is due in large part to the discovery of more small cancers. It is reported that the proportion of tiny cancer in thyroid cancer is very high, reaching about 20% to 35% [1]. Small thyroid cancer is defined as the diameter of less than 1cm of cancer [2],