Abstract
A 53-year-old male with an invasive thymoma extending to the superior vena and right atrium, presenting as superior vena cava syndrome is herein reported. However invasive thymoma with this growth pattern is extremely rare. In this case, the tumor was successfully resected via median sternotomy with cardiopulmonary bypass. After 17 months of follow-up, the patient was still free from any signs and symptoms indicative of superior vena cava syndrome, but recurrent tumor in the right pleura was observed on the follow-up chest computed tomography.