Bronchoscopy may be helpful in cases of a mediastinal teratoma with pulmonary involvement of the bronchial trees.当纵膈腔畸胎瘤并肺部之支气管侵犯时，以支气管镜检查可能会有帮助。
However, a mediastinal teratoma is rarely considered in a patient presenting with hemoptysis.当一个病人咳血时，很少会去想到纵膈腔畸胎瘤。
We report herein a case of hemoptysis caused by a mediastinal teratoma with pulmonary involvement.我们报告一个病例为纵膈腔畸胎瘤以咳血为征状表现。