目的观察和分析肺部CT上甲状 腺病变的影像特征。方法 随访3750例可 显示甲状腺的肺部CT中发现甲状腺病变的 450例患者，分析甲状腺CT值、甲状腺结 节特征、周围淋巴结等CT表现。连续选取 100例正常甲状腺作为对照组。统计受检 者的辐射剂量。辐射剂量采用t检验；各 组甲状腺的CT值比较采用方差分析。结 果 肺部CT中有无甲状腺显示的受检者间 辐射剂量无明显差异。450例患者中以甲 状腺肿及结节性甲状腺肿最为常见，其 次为甲状腺腺瘤、甲状腺炎、Graves病及 甲状腺肿恶性病变。甲状腺炎85例，腺 体CT值明显降低，平均约(54.2±15.3) HU(P<0.01)。Graves病35例，表现为弥漫 性增大，密度减低，无结节。甲状腺肿、 结节性甲状腺肿共210例，20例甲状腺肿 无结节；190例结节性甲状腺肿共270个结 节，24例结节囊变，59例结节钙化。甲状 腺腺瘤92例，84例为单发结节或肿块，8 例单侧多发结节，结节可囊变(45例)、钙 化(9例)。甲状腺恶性病变28例，17例可 见不规则或颗粒状钙化，10例囊变(3例可 见壁结节)，12例淋巴结增大，病变与正 常甲状腺及周围结构分界不清。结论 肺 部CT中有较高概率显示甲状腺并发现甲状 腺病变，且在CT上具有一定的特征性表 现。

Objective To observe and analyze the CT features of thyroid lesions in pulmonary CT. Methods A total of 450 cases of thyroid lesions were followed up in 3750 cases, CT values of thyroid, thyroid nodules, peripheral lymph nodes and other CT features were analyzed. A total of 100 consecutive patients with normal thyroid as control group. Radiation dose for the subjects. comparison of the radiation dose using t test; and the CT values of thyroid in each group were compared with the analysis of variance. Results There was no significant difference in the radiation dose among the subjects with or without thyroid in the pulmonary CT. In 450 cases of patients, goiter and nodular goiter is the most common, followed by thyroid adenoma, thyroiditis, Graves' disease and thyroid malignant lesions. 85 cases of thyroiditis, the gland of CT values was significantly lower, the average is about (54.2±15.3) HU (P<0.01). 35 cases of Graves' disease, the density decreased, without nodules. 210 cases of Goiter and nodular goiter. 20 cases of goiter, 190 cases of nodular goiter, and all cases have 270 nodules. 24 cases have nodules lesions, 59 cases have nodular calcification. Thyroid adenoma in 92 cases, 84 cases of solitary nodules or masses, 8 cases of unilateral multiple nodules, nodules can be cystic changes (45 cases), calcification (9 cases). Thyroid malignant lesions in 28 cases, 17 cases of irregular or granular calcification, 10 cases of cystic changes (3 cases of the wall nodules), 12 cases of lymph nodes, the lesions and normal thyroid gland and surrounding structure is not clear. Conclusion There has a higher probability of showing and found thyroid lesions in the pulmonary CT. and thyroid lesions had characteristic features on CT.