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Background: Advanced technology and understanding of robotic surgical system have rendered robotic thyroid surgery more expanding. The aim of this study was to identify the periodic changes in postsurgical outcomes of robotic thyroid surgery performed by a single surgeon.Methods: We conducted a retrospective review of 700 robotic thyroid surgery cases using gasless trans-axillary approach.Results: All patients underwent successful operations without conversion to open surgery, and were mostly younger than 45 years, female, less-extended thyroid surgery and lymph node dissection, and thyroid cancer. The median follow-up period was 67 months (12-99 months). Regarding technical outcomes, the operation time declined steeply after 100 consecutive cases, and reached 120.0-132.7 minutes for thyroid lobectomy and 162.9-174.1 minutes for total thyroidectomy (TT). The most common complication was transient hypoparathyroidism (43.7%), whose incidence decreased steeply to a range of 9.1% to 25.0% after 300 consecutive cases. Regarding surgical completeness for thyroid cancer, an average of seven lymph nodes was retrieved through central compartment node dissection without fluctuation over time. The proportion of the patients with serum stimulated thyroglobulin levels <10 ng/mL at the time of radioactive iodine remnant ablation after TT and <1 ng/mL 6-12 months after the first remnant ablation ranged between 86.4%-100% and 66.7%-100%, respectively, without significant fluctuation.Conclusion: For properly selected patients, robotic thyroid surgery is useful surgical option with reliable technical outcome and surgical completeness and cosmetic benefit. [ABSTRACT FROM AUTHOR]