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The subxiphoid approach is useful in thymectomy, and its disadvantages can be ameliorated by the robot-assisted surgery( RAS). It was suggested that the increase in the number of ports due to RAS in the thymectomy with the trans-subxiphoid approach( RTts) would not be a disadvantage in any aspect other than cosmetology. RAS offers surgeons various technical advantages in thymectomy, however these are difficult to quantify. Therefore, it is difficult to objectively show the merits corresponding to expensive devices. It is necessary to conduct new clinical tests and collect data showing the superiority of RTts.