A case of lung and lymphnode metastasis treated with carbon ion radiotherapy after radical nephrectomy for renal cell carcinoma

: We report a case of lung and lymph node metastasis treated with carbon ion radiotherapy after radical nephrectomy five years earlier. The patient was a 70-year-old woman. She was diagnosed with lung and neck lymph node metastasis by chest computed tomography four years after surgery. The metastatic mass increased gradually despite interferon-alpha and interleukin-2 treatment. Carbon ion radiotherapy was applied to the metastatic mass, and it has not increased in size to date. Carbon ion radiotherapy is thus regarded as an effective treatment for metastatic renal cell carcinoma masses, and it can be an important option for treatment of renal cell carcinoma.