[A case of renal cell carcinoma in a horseshoe kidney: a case report]

A case of renal call carcinoma associated with horseshoe kidney is reported. The patient was a 59-year-old woman complaining of right flank mass. Radiological examination showed right renal tumor and horseshoe kidney, and right nephrectomy was performed. Histological examination showed it to be clear cell type renal cell carcinoma. Only 17 cases of horseshoe kidney with renal cell carcinoma have been reported in Japan. We report the 18th case with a review of the literature.