Abstract
A 72-year-old man was detected as having a right renal tumor and gallbladder tumors by preoperative abdominal computed tomography, and was diagnosed as having double cancer. We performed right nephrectomy and cholecystectomy. The solid gallbladder tumor was pedunculated, and in addition, a round polypoid lesion was present in the gallbladder body. Histopathologically, both the renal and gallbladder tumors showed the morphology of renal cell carcinoma, and were diagnosed as primary renal cell carcinoma and metastatic renal cell carcinoma of the gallbladder, respectively. To the best of our knowledge, metastatic renal cell carcinoma of the gallbladder is rare. These two forms of metastatic renal cell carcinoma of the gallbladder are considered characteristic and may suggest that these lesions show morphological changes as they progress.
