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The purpose of this research study was to assess the safety and surgical outcomes of endoscopic thyroidectomy applied via a unilateral axillobreast approach with CO2 insufflation to one-sided benign thyroid tumors in Vietnam. Only 1 patient of the 50 (2%) had a postoperative hematoma at the surgery site. Open surgical conversions did not occur. The duration of postoperative drainage was from 3 to 8 days, or 4.86±1.24 days on average. The length of stay in the hospital after surgery was 4 to 9 days, or 5.9±1.2 days on average. The postoperative pain in the first postoperative days was lower in intensity compared with open surgeries. The given method provided better results in terms of patient satisfaction with the cosmetic effect of the surgery compared with up-front surgery, minimally invasive video-assisted thyroidectomy, and endoscopic procedures via the breast approach, and 96% of patients were completely satisfied.