High-frequency Ultrasound Combined With CT For Papillary Thyroid Microcarcinoma Assessment Of Lymph Node Metastasis

Objective:To investigate the diagnostic value of high-frequency ultrasonographic,CT examination and the combination of the two in preoperative evaluation of lymph node metastasis of papillary thyroid microcarcinoma.Methods:Retrospective analysis of 64 patients with papillary thyroid microcarcinoma diagnosed by pathological results in the People’s Hospital of Ningxia Hui Autonomous Region from January 2016 to December 2017.Preoperative high-frequency ultrasonographic or CT examination,according to the order of admission They were divided into high-frequency ultrasonographic group(n=64)and CT group(n=39).Both groups underwent papillary thyroid microcarcinoma resection and lymph node dissection.The two examination methods and the combined results of the two were compared with the postoperative lymph node pathological results.Preoperative high-frequency ultrasonographic,CT and the combination of the two were used to evaluate the coincidence rate,sensitivity,specificity,positive predictive value and negative predictive value of lymph node metastasis of papillary thyroid micrcarcinoma.Results:The coincidence rates of lymph node metastasis,high-frequency ultrasonographic,CT and their combined diagnosis of lymph node metastasis of papillary thyroid microcarcinoma were 70.31%,69.23%,and 81.82%.The sensitivity,specificity,positive predictive value and negative predictive value of high-frequency ultrasonographic diagnosis of lymph node metastasis was 75.68%,68.38%,73.68%,62.96%.The sensitivity,specificity,positive predictive value andnegative predictive value of ct diagnosis of lymph node metastasis was 68.42%,70.0%,68.42%,70.0%.The sensitivity,specificity,positive predictive value and negative predictive value of high-frequency ultrasonographic combined with CT diagnosis of lymph node metastasis was84.21%,70.0%,72.73%,82.35%.The incidence of postoperative complications in the high-frequency ultrasound group was 8.0%.The incidence of postoperative complications in the CT group was 10.26%.There was no significant difference in the incidence of complications between high-frequency ultrasound and CT.Conclusion:High-frequency ultrasonographic combined with CT or single high-frequeNcy ultrasonographic to evaluate the accuracy of lymph node metastasis of papillary thyroid microcarcinoma is higher than CT examination.CT can assess regional lymph node metastasis without mediastinal ultrasound and assess lung metastasis.High-frequency ultrasonographic and CT assessment of lymph node metastasis of papillary thyroid microcarcinoma can be promoted and applied in clinical work.