It is now generally recognized that adenosarcoma of the kidney is one of the most common malignant neoplasms of childhood. Most authors place it next to tumor of the eye in frequency, although at the Memorial Hospital for the Treatment of Cancer and Allied Diseases, New York,1it was exceeded in order of occurrence by peripheral sarcoma and bone tumor as well as by ocular neoplasms. This brief report covers fourteen renal tumors in children seen at the State University of Iowa Hospitals between Jan. 1, 1931, and Jan. 1, 1938. The results in a series of this size are worth recording. While my associates and I make no claim of innovation in either diagnosis or treatment, I am sure that a discussion of both will not be without value. The pathogenesis of these tumors has been admirably and adequately discussed by Dean and Pack,1Hinman and Kutzmann