Teratoma of mediastinum is rare germ cell tumor. Anterior mediastinum is the most common extragonadal site. Benign mediastinal teratoma accounts for 60% of all mediastinal germ cell tumors. Benign mature teratoma has excellent prognosis after surgical excision. We present a case of 20-year-old woman diagnosed as benign mature teratoma which compressed main pulmonary trunk. The patient underwent surgical excision.J Clin Med Res. 2015;7(9):726-728doi: http://dx.doi.org/10.14740/jocmr2270w
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机译：纵隔畸胎瘤是罕见的生殖细胞肿瘤。前纵隔是最常见的性腺外部位。良性纵隔畸胎瘤占所有纵隔生殖细胞肿瘤的60％。良性畸胎瘤手术切除后预后良好。我们提出一例20岁的女性，被诊断为良性成熟畸胎瘤，压缩了主肺干。该患者接受了手术切除。JClin Med Res。 2015; 7（9）：726-728doi：http://dx.doi.org/10.14740/jocmr2270w
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