Solitary metastasis from renal cell carcinoma in the anterior mediastinal lymph node

Solitary metastasis of renal cell carcinoma (RCC) in the mediastinal lymph nodes is rare in patients without lung metastasis. We herein report a case of RCC with solitary mediastinal lymph node metastasis. A mass in the anterior mediastinum was found in the chest computed tomography (CT) scan of an asymptomatic 43-year-old-man. A mass on the right kidney was also revealed in an abdominal CT scan. The anterior mediastinal mass was removed. It was histologically diagnosed as a metastatic renal cell carcinoma of the anterior mediastinal lymph node. The patient subsequently underwent radical right nephrectomy and was diagnosed with renal cell carcinoma. Although the metastatic route from the right kidney to the mediastinal lymph node is unknown, solitary metastasis to the anterior mediastinal lymph node is possible.