Surgical treatment of lung adenocarcinoma tumor thrombus extending into the left atrium: A case reportZhongjian Chong1+, Yu Tang1+, Aiping Zhang1*, Zijian Ma1*1 Department of Thoracic Surgery, Nanjing First Hospital, Nanjing Medical University, Nanjing, China+Zhongjian Chong and Yu Tang contributed equally to this work.*Correspondence: Zijian MaDepartment of Thoracic and Cardiovascular Surgery,Nanjing First Hospital, Nanjing Medical University, 68 Changle Road,Nanjing 210029, China(13092361011@163.com)Aiping ZhangDepartment of Thoracic and Cardiovascular Surgery,Nanjing First Hospital, Nanjing Medical University, 68 Changle Road,Nanjing 210029, China(apzhdoc68@163.com)Key Clinical Message:When lung adenocarcinoma with a tumor thrombus extending into the left atrium through the pulmonary vein, it is already at stage IIIA. Patients with such conditions often face a poor prognosis.This article reports a case of surgical treatment for lung adenocarcinoma with tumor thrombus extending to the left atrium.Key words: lung adenocarcinoma, left atrial tumor thrombus, local advanced stage, driver gene