[A Meta-analysis of risk factors related to the lymph nodes posterior to the right recurrent laryngeal nerve in thyroid micropapillary carcinoma].

To evaluate the risk factors for metastasis of the lymph nodes posterior to the right recurrent laryngeal nerve in thyroid micropapillary carcinoma（PTMC） by Meta-analysis. We searched domestic and foreign databases for relevant studies published up to June, 2020. Two independent reⅥewers performed literature screening and data extraction according to the inclusion and exclusion criteria. Then, Meta-analysis was performed using Revman 5.3 software. A total of 5 articles were included, with a total of 1884 subjects.The results of the study showed that the rate of lymph node metastasis in PTMC Ⅵb area was 10.8% （203/1884）. The risk factors for metastasis included patients' age <45 years old, male, right lobe tumor Diameter ≥0.5 cm, invading the envelope, Ⅵa lymph node metastasis. Ⅵb lymph node dissection is recommended when there exists age<45 years, male sex, right lobe tumor≥0.5 cm, capsular invasion or Ⅵa lymph node metastasis.