A 78-year-old female was admitted to Shizuoka red cross hospital because of an abnormal shadow at the right upper lung field on chest X-ray film. A left atrium myxoma was detected at chest CT scan after admission. Though the lung tumor was well defined and hilar and mediastinal lymph nodes were not swollen at CT scan, the tumor was suspected a small cell carcinoma at the result of trans-bronchoscopic biopsy. Firstly we performed removal of the left atrium myxoma, and two months later, we performed thoracotomy and partial resection of the right upper lobe. The lung tumor was finally diagnosed as a typical carcinoid. We have followed the patient for about 32 months after the operation and there is no evidence of tumor recurrence.