A case of metastatic lung cancer from renal cell carcinoma complicated with hamartoma in the same segment

Abstract

A 63-year-old man underwent unilateral nephrectomy for renal cell carcinoma in 2001. In 2007, chest CT scans revealed three small nodules in the same segment of the right lower lobe, and they were suspected of being metastatic lung cancer. They grew very slowly, and were resected in 2012. Pathologically, two of the three lesions were metastatic lung cancer from renal cell carcinoma, and one was hamartoma. All tumors were smooth, round-shaped, and well-defined, and there was no difference in their tumor doubling time. We report that there can be no evident difference in the growth speed between metastatic lung cancer from a slow-growing-type renal cell carcinoma and benign lung tumor.