Malignancy associated with horseshoe kidney

A compilation of the reported cases of cancer in horseshoe kidney from 1895 to 1975 is presented along with a comparison of the incidence of the various types of tumor involved from 1895 to 1966 and 1966 to 1975. An additional case of hypernephroma is added to the literature for a total of 111 cases reported to date. The increase incidence of both carcinoma of the renal pelvis and nephroblastoma is discussed.