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