Induction of anesthesia. Intubation by the anesthesia colleagues. Inspection of the tumor region using narrow band imaging. An oval structure is seen in the anterior third of the edge of the tongue on the left side. This is examined using NBI and contact endoscopy. There are also whitish changes on the floor of the mouth, which were previously described by dermatologists as lichen ruber planus. Biopsies are taken again from all sides. ThenZZZZn the tongue and cut around the tumor, first with a monopolar needle, then with scissors and tweezers. The tumor specimen is removed in its entirety. Then marginal samples are taken from the tumor and sent for frozen section. The tumor specimen shows R0 on all sides, with slight dysplasia in the lateral area. However, the pathologists are ultimately unable to rule out carcinoma in situ and recommend a resection. This is carried out. Hemostasis by means of bipolar coagulation and completion of the procedure without complications.