목적: The objective of this study was to report 1st application of robot to resect recurred sinonasal malignant melanoma via combined transantral and endonasal port. 방법:A 51-year-old woman presented with recurred malignant melanoma occurred at inferior portion of right posterior choana. First, right mega-antrostomy was done with usual endoscopic sinus surgery equipment. To obtain an accessible working space, posterior septectomy was performed. Next, right anterior maxillary windows were created through a gingivobuccal incision. The da Vinci robot (Intuitive Surgical Inc., Sunnyvale, California) was used to perform to resect tumor. The 8.5-mm diameter 0- or 30-degree three-dimensional camera arm was introduced into right nostril. The two 5-mm diameter articulating EndoWrist arms entered through the transantral or endonasal port. For the dissection, Maryland articulated forceps, needle driver, and monopolar spatula- or hook-type electrocauterizer were used. 결과:The 8.5-mm diameter of the camera arm was easily inserted into right nostril. Excellent access to posterior nasal cavity and nasopharyngeal area from the level of the palate up to the skull base was possible. Bilateral robotic arms were able to move inside and the tumor could be resected via combined transantral and endonasal port. After 4 days of hospitalization, the patient was discharged without any complications. 결론:This is the first report of application of Da vinci robot to resect sinonsasal via combined transantral and endonasal port. This new approach may be applied to selected patients with tumor occurred in sinonasal or nasopharyngeal area.