Introduction and objective: Surgical treatment of Myasthenia Gravis (MG) with a use of the robotic system has been applied worldwide foSurgical treatment of myasthenia gravis with a use of the robotic system has been applied worldwide over past 20 years. On February 22, 2022, for the first time in Poland, extended thymectomy using robot-assisted thoracoscopic surgery approach was performed at the Military Institute of Medicine – National Research Institute in Warsaw. Material and methods: Three port, left-sided approach with CO₂ insufflation was performed. The left phrenic nerve was located and left lower pole of the thymus with fat of the left diaphragmatic angle was dissected. Further dissection of the thymus from the pericardial sac and along the left phrenic nerve with visualisation of the left brachiocephalic vein up to the level of the thyroid lobes was performed. Thymic veins were managed and the upper poles of the thymus were dissected. Right pleural cavity was opened and thymus was removed along right phrenic nerve with right lower pole of the thymus and surrounding fat tissue of right diaphragmatic angle. Specimen was removed and both pleural cavities were drained using single 24 Fr drain. Results: The operative time was 162 minutes, postoperative course was uneventful. The total postoperative drainage measured 50 ml and chest tube was removed on the first postoperative day. The amount of pain the patient suffered was moderate. The patient was discharged from the hospital on the second postoperative day. On the pathological study an atrophic thymus with mediastinal lymph nodes and fatty tissue were found. Conclusions: Robot-assisted thoracoscopic surgery extended thymectomy allowed for safe and radical resection of the thymus and surrounding fat tissue with a reduction in the time of hospitalization.