After an introductory consultation with the anesthesia colleagues, the patient is first positioned and the supraglottis is adjusted on the left side using the size B small bore tube. Beforehand, complete mirroring of the oral cavity, oropharynx, hypopharynx and larynx. There is no evidence of a further mass. The tumor of the supraglottis on the left side is narrow-based and stemmed laterodorsal to the arytenoid hump and extends from here to the anterior wall of the piriform sinus. The tumor can now be easily cut around at its base with a safety margin of about 3-4 mm. The tumor shows an extremely shallow penetration depth and can be resected superficially here. Complete resection of the tumor is achieved using microsurgical techniques and resection with the CO2 laser. Representative marginal samples are then taken from the area of the basal metastasis and all metastatic margins. These are sent intraoperatively for frozen section diagnostics. All of these marginal samples are found to be tumor-free in the frozen section intraoperatively, so that the procedure can be completed after a final consultation with the anesthesiology colleagues and removal of all instruments after the final wound check and absence of bleeding.