Abstract
The patient was a 69-year-old male who had underwent right nephrectomy for right renal cell carcinoma at 61 years of age. A mass was detected in the anterior mediastinal region by CT after 7years of follow-up, and tumorectomy was performed. Based on the excised tissue findings, thymic cancer was diagnosed. Multiple shadows were noted in the lung one month after the diagnosis, suggesting lung metastasis. At the same time, a mass was detected in the right neck, and the patient was referred to our department. The mass was 15mm in diameter, elastic, hard, and had an embankment-like surrounding and ulcer in the center. On histology, atypical cells containing large nucleoli and bright nuclei formed a solid alveolar lesion, showing squamous cell carcinoma. Since it was very similar to the primary lesion, it was diagnosed as skin metastasis from squamous cell carcinoma of the thymus origin.
