After active patient identification, the patient is taken to the operating theater. Induction of anesthesia and intubation (laser tube) by the anesthesia colleagues. Positioning of the patient by the surgeon. Setting up the C02 laser. Adjustment of the endolarynx with the size B small bore tube. A cT1a glottic carcinoma is seen on the left, which completely occupies the middle and anterior third of the vocal fold and extends to just behind the anterior commissure on the left side, but does not extend into it. In terms of width and height, it extends approx. 3 mm down the subglottic slope. It does not extend into the sinus morgagni. Now mark the resectate borders with the CO2 laser superpulsed to 4 watts continuous wave. Then resection of the tumor from posterior to anterior with a safety margin of approx. 2 mm to the depth and edges. Minor bleeding in the area of the anterior commissure, which is coagulated with the D-focused CO2 laser and the bipolar forceps. Subsequent margin samples anterior commissure, free vocal fold margin and caudal wound margin including the posterior resectate margin. R0 situation in the frozen section. Therefore, light smoothing of the wound edges with tongues and scissors in the area of the free vocal fold margin. With dry conditions, the operation was then completed without complications. Conclusion: R0 resection of a cT1a glottic carcinoma on the left side with the CO2 laser in a frozen section. Further procedure after receipt of the histology.