[A case of invasive thymoma that recurred with pericardial effusion 15 years postoperatively]

We treated a 74-years-old male who had recurrence with pericardial effusion and a tumor between the pulmonary artery and left atrium 15 years after operation for invasive thymoma complicated by myasthenia gravis. Despite pericardial drainage, CDDP infusion, and radiation therapy for the tumor, the patient died due to pneumonia after 1 and half years. Long-term observation is considered to be needed after surgical resection of thymoma for recurrence or multiple oncogenesis in ectopic thymus.