Post-radiochemotherapy (total reference dose: 66.0 Gy) until <2005> for CUP syndrome (Tx pN2c). Tumor-suspected area in the area of the left edge of the tongue as part of the tumor follow-up. Biopsy was performed externally. Pathohistolog. Presence of a keratinizing squamous cell carcinoma. There is now an indication for panendoscopy and excision biopsy of the tongue margin tumor on the left side. The patient had ample opportunity to ask questions about the procedure before the operation.