[Incidental detection of thymic mucoepidermoid carcinoma with massive calcification; report of a case].

31-year-old man who complained of chest pain due to chest wall wound caused by tumble. He took chest X-ray examination and suggested of having mediastinal tumor. Computed tomography (CT) scan revealed 3.0 cm mass in diameter with irregular shaped calcification and lobulated cystic lesion (size : 21 x 17 x 41 mm). The mediastinal tumor was totaly removed by surgical operation. No invasive portion was observed between mediastinal pleura and solid tumor. Pathological examination revealed that tumor was composed of mucoepidermoid carcinoma of the thymus and postoperative adjuvant radiotherapy was performed. The patient have survived without disease for 3 years after surgery.