1. Patients with primary thyroid lymphomas should be approached individually using all available methods of treatment, including surgery and radiotherapy and/or chemotherapy. 2. Diagnosis of cold nodules in patients with oncological history should always arouse suspicion of metastases to the thyroid gland. 3. Diagnosis of non-thyroid cancer prior to surgery is difficult to obtain. 4. The need for surgery is usually based on local compression.

Primary melanomas in the gastrointestinal tract are extremely rare, with an estimated prevalence of 0.5 to 1 case per million. Primary mucosal melanomas of gastric origin account for approximately 1-3% of all primary melanomas in the gastrointestinal tract. We present the case of a patient who underwent surgery due to primary gastric melanoma.