The Value Of Ultrasonography In Assessing Central Lymph Node Metastasis In PTMC

OBJECTIVE: To investigate the diagnostic value of ultrasonography in the diagnosis of central lymph node metastasis(CLNM)in papillary thyroid micro-carcinoma(PTMC).To study the risk factors of PTMC central regional lymph node metastasis.Methods: The clinical data of patients who underwent ultrasonography between 2013 and 2016 were analyzed retrospectively.The sensitivity,specificity,accuracy,positive predictive value and negative predictive value of ultrasonography in central lymph node metastasis.The patients were divided two groups according to whether there were metastases in the central lymph nodes.The age,sex,boundary,shape,echo properties,echo uniformity,location,proximity to the capsule,Calcification,whether associated with a series of factors such as Hashimoto and lymph node metastasis of the central relationship.RESULTS: The metastatic rate of micro-papillary thyroid carcinoma was 25.4%.The sensitivity,specificity,accuracy and negative predictive value of ultrasonography in the diagnosis of lymph node metastasis of central papillary thyroid carcinoma were 31.9%,93.8 %,78.1%,63.8%%,80.2%,respectively.The cutoff value of the number of metastatic lymph nodes that could be detected by ultrasound was 1.5 and the detectable metastatic lymph nodes The cutoff value for the size was 4.4 mm.There were significant differences in male patients,age ≤45 years,primary tumor≥7mm,and non-calcified plaque,elasticity score 4-5,invasion the capsular in the central region between the metastatic group and the non-metastatic group.CONCLUSIONS: The central lymph node metastasis rate of PTMC is low,and the metastatic lymph nodes smaller,less number,the distribution of the location of the deeper,easy to be blocked,so ultrasound diagnosis of central PTMC central lymph node metastasis has some limitations.Patientmale,age≤45 years,primary tumor≥7mm,non-calcified plaque,elasticity score 4-5,invasion the capsular as a risk factor for CLNM.