[Clinical and ultrasonic features of papillary thyroid microcarcinoma and risk factors for central lymph node metastasis].

To investigate the clinical and ultrasonic features of papillary thyroid microcarcinoma （PTMC） and the risk factors of central lymph node metastasis （CLNM）, to provide help for individualized treatment. One hundred and eighty-five patients with PTMC confirmed by surgery and pathology and underwent prophylactic CLN dissection were retrospectively analyzed. According to lymph node metastasis, patients were divided into metastasis group and non metastasis group. The size, shape, echo, aspect ratio, edge, protruding capsule, nodule location, calcification and calcification were analyzed. The relationship between clnm and ultrasonographic features, sex, age, single/multiple, whether or not with Hashimoto thyroiditis was analyzed. Among 185 patients with PTMC, 55 cases had lymph node metastasis, and the metastasis rate was 30.0%. In univariate analysis, clnm of PTMC was significantly correlated with gender, age, tumor size, protruding capsule, type of calcification and single / multiple （all <0.05）. In multivariate logistic regression analysis, tumor size, single/multiple, protruding capsule, gender and age were the risk factors of clnm. According to the ROC curve, when the age was 49.5 years old and the mass size was 4.8 mm, the diagnostic test yoden index reached the maximum value. When the risk factors of male, ≤49.5 years old, tumor size≥4.8 mm, multiple and protruding capsule appeared in PTMC patients, preventive CLN clearance should be taken actively.