Surgery plays an important role in the treatment of anterior mediastinum disease. The major surgical approaches include: cervical approach, mid-sternal approach, cervical combined mid-sternal approach and video-assisted thoracoscopic approach. The cervical approach is rarely adopted because of its restricted visual field. The cervical combined mid-sternal approach have a broader field of vision, given this advantage, the surgeon can remove the thymus and its surrounding fat tissue more thoroughly. But the trauma of this approach is much larger, and the postoperative complication is also a serious problem. The video-assisted thoracoscope is often adopted by left or right approach, this minimally invasive procedure can not remove anterior mediastinum fat thoroughly. In clinical practice, the investigators designed a new method named "3-Hole" subxiphoid approach. This study is designed to compare the safety and validity between this new method and others.
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Amount of bleeding
Timeframe: Participants will be followed for the duration of hospital stay, an expected average of 5 days
Rate of conversions to thoracotomy
Timeframe: Participants will be followed for the duration of hospital stay, an expected average of 5 days
Duration of operation
Timeframe: Participants will be followed for the duration of hospital stay, an expected average of 5 days
Mortality rate
Timeframe: up to 10 years
Overall survival
Timeframe: up to 10 years
Quality of life
Timeframe: up to 10 years after operation
Number of Participants with Adverse Events
Timeframe: up to 8weekss afte operation