The occurrence of injury to the kidney from physical force presents a problem which may tax the diagnostic experience and acumen of the surgeon to the utmost. The steady rise in the number of automobile accidents throughout the country has led to a corresponding increase in the number of injuries to the kidney, which is reflected in the literature by several reports of extensive series of such cases by Schenck,1 Osgood and Campbell2 and Wood.3 In these reports the physical mechanism of the injury, the difficulties in diagnosis and the possibility of concomitant injury to other structures have been reported in detail. The methods of combating shock, which is present in a high percentage of cases of acute injury, and the points on which the surgeon's choice of operative or expectant treatment is based, are discussed in detail. In most of the series of case reports the