Post-panendoscopy from <2016> with ablation of leukoplakia in the area of the right alveolar ridge and right anterior palatal arch. Histology revealed a carcinoma in situ on the right alveolar ridge and a G3 differentiated squamous cell carcinoma and carcinoma in situ on the right anterior palatal arch. Post-resection with intraoperative frozen section diagnostics was discussed at the interdisciplinary tumor conference.