Post-transoral resection of a pT1a pN2a oral cavity carcinoma in 2014 with adjuvant simultaneous radiochemotherapy as well as dose saturation using interstitial brachytherapy. As part of the regular tumor follow-up, a slightly suspicious change in the mucosa in the area of the left-sided glossotonsillar groove was discovered. There is now an indication for panendoscopy and excision biopsy in the area of the left glossotonsillar groove. The patient had ample opportunity to ask questions about the procedure before the operation.