<CLINICIAN_NAME> initially <2014> presented to our university outpatient clinic with a mass on the underside of the tongue that had been present for approx. 5 days. The biopsy of the mass on the underside of the tongue showed histologically detectable infiltrates of a moderately differentiated, small focal and keratinizing squamous cell carcinoma. Sonographically, no space-occupying lesion could be visualized on the floor of the mouth with a cN0 neck status; in addition, a primarily non-suspicious mass of the thyroid gland on the right side measuring 24 x 16 x 24 mm was found sonographically. Therefore, indication to perform a panendoscopy with excision of the histologically confirmed malignant mass on the underside of the tongue. However, after consultation with <CLINICIAN_NAME>, a coarse needle biopsy of the right-sided thyroid nodule was initially not performed during the operation as the patient's malignant disease should be treated first.