After induction of anesthesia and rigid tracheoscopy - the upper part of the trachea is visible and free - intubation by the anesthesia colleagues. Now intubation using a small bore tube. In the glossotonsillar groove on the left side, the ulcerated mass described above is seen, approx. 1 x 1 cm in diameter, but with irregular mucosal extensions, extending far anteriorly into the glossotonsillar groove and the edge of the tongue on the left side. In the further oropharynx/hypopharynx and larynx no evidence of a mass. Demonstration of findings to <CLINICIAN_NAME>. He recommends primary excisional biopsy. Resection of the ulcerative mass with an appropriate safety margin by <CLINICIAN_NAME>. Attempt to preserve the mucosa over the mandible. This is now exposed in a favorable position. Careful hemostasis using bipolar coagulation. The preparation is thread-marked for frozen section diagnostics. Here, the cranial and caudal resection margins are found to be moderate dysplasia cranially and carcinoma in situ caudally. Therefore indication for resection. Post-resection by <CLINICIAN_NAME> using scissors. Again removal of marginal samples. These are again sent for frozen section diagnostics and are found to be tumor-free according to <CLINICIAN_NAME>. Now esophagogastroscopy. Signs of reflux esophagitis here. No evidence of tumor growth. No evidence of tumor in the stomach either. Retraction of the esophagogastroscope. Inspection of the wound bed again. No bleeding here. End of the operation without bleeding, without complication.