Five cases of surgically treated thymic carcinoma are reported. The patients (4 men and a woman) ranged in age from 46 to 76 years old with a mean of 64.6. Four patients were asymptomatic and an abnormal shadow on X-ray films was noted. One remaining patient suffered from hoarseness. One patient had stage II disease and the others had stage III. Surgical tumor resection was performed in all cases. Only 1 patient among the 5 underwent a successful complete resection. Histological examinations of the resected specimens revealed squamous cell carcinoma of thymus. Four specimens were poorly differentiated and 1 is moderately differentiated carcinoma. All patients received radiation therapy post operatively. Three patients are alive without any recurrence 6, 8 and 109 months after the surgery. Thymic carcinomas are frequently invasive or metastatic at the time of diagnosis. But poorly differentiated group, in squamous cell carcinoma, mucoepidermoid carcinoma and besaloid carcinoma, are characterized by a low incidence of local recurrence and distant metastasis. They also have a good sensitivity for the radiation. Therefore complete surgical resection combined with postoperative radiation therapy should be a choice in treating thymic carcinomas. We considered that complete resection and postoperative radiation therapy is a curative therapy for thymic carcinomas.