Thymic cysts generally do not grow back after surgery. Thymic cysts are benign lesions, and there is only a theoretical possibility of recurrence after surgical removal. 1. Thymic cysts are basically benign congenital upper mediastinal lesions, most of which are now treated with minimally invasive thoracoscopic surgery, which has a clear field of vision and can be removed with complete stripping, and will not grow again after surgery. 2. In the minimally invasive thoracoscopic surgery for thymoma combined with thymic cyst, the thymic cyst can be completely removed with the thymoma, and the thymic cyst will not grow again after the surgery. 3. When some larger thymic cysts are operated, the wall of the cyst may be severely adhered to the surrounding organs such as trachea or blood vessels, and a small amount of cystic wall may remain after surgery; if more cystic wall remains, theoretically, there is a possibility of recurrence. If you feel uncomfortable after surgery for thymic cysts, it is recommended that you go to the hospital in time to avoid delaying your condition.