[Analysis of the factors for the lymph node metastasis in rⅥb region of thyroid micropapillary carcinoma and the application value of intraoperative nano-carbon].

Objective:To investigate the relationship between lymph node metastasis in rⅥb region and pathological features of papillary thyroid microcarcinoma, and the application value of carbon nanoparticles in the operation for lymph node dissection in rⅥb region. Method:One hundred and seventy-five patients were divided into carbon nanoparticles group and the control group depending on whether carbon nanoparticles were used in the operation. The operation time, the number of central lymph node, the number of rⅥb region lymph node, hypocalcaemia symptom complex and hoarseness after the operaion were compared between the two groups. The lymph node metastasis in the rⅥb region and the pathological features of papillary thyroid microcarcinoma were statistically analyzed. Result:The amount of lymph nodes in Central District and rⅥb region was increased and the probability of parathyroid gland injury was decreased by using nano-carbon. The positive rate of lymph nodes in rⅥb region was not related to age, sex, aspect ratio of nodules and microcalcification, but was related to the tumor size, multifoci and the invasion of the capsule. The evaluation model of lymph node metastasis in rⅥb region was established based on the above three correlative features of color doppler ultrasound. The ROC curve analysis showed that the model had high application value . Conclusion:The tumor size, multiple foci and capsule invasion are risk factors for lymph node metastasis in rⅥb region of thyroid micropapillary carcinoma.