Conclusion: Neurogenic tumor heads the list of the study, thymoma is the second and teratodermoid is the third.Chest X-ray examination is the common access to diagnose primary MTC.

• 结论：在原发性纵隔肿瘤及囊肿中，神经源性肿瘤的发病率居首位，其次为胸腺瘤和畸胎样瘸：胸部X线检查是诊断本病的主要手段；