A 52-year-old woman was admitted to our hospital because of an abnormal shadow on chest X-ray. Chest computed tomography scan and magnetic resonance imaging demonstrated an anterior mediastinal tumor. The tumor was extirpated completely with combined partial resection of the left lung through a median sternotomy. Microscopically, the tumor was diagnosed thymic cancer, basaloid carcinoma. The patient was treated with combination chemotherapy and radiation, postoperatively. We reported a case of thymic carcinoma.