Abstract: Thymic malignancies are relatively incident solid tumors.And Lymph node metastasis in thymic malignancies used to be considered a rare phenomenon.Recently，increasing studies have shown that the lymph node metastasis in thymic malignancies is much more common than previously recognized.Yet，impact of lymph node metastasis in thymic tumor on prognosis and the strategy for surgical dissection of lymph nodes in thymic tumors need to be further explored.This paper focus on pattern of nodal involvement，its prognosis impact，and lymph node dissection in thymic malignancies.

Key words: thymic malignancies, lymph node metastasis, lymph node dissection