—Harrison and Botsford1 review a group of 72 cases of congenital anomalies of the kidney. Twenty-one patients required operative surgical intervention; seven of the operations were for calculi, and fourteen were for congenital hydronephrosis. Forty patients were returned to full military duty and 6 to limited duty, and 25 were evacuated to the United States. One patient died. Renal lithiasis, pyelonephritis and hydronephrosis were the conditions superimposed on the renal anomalies. It is thought, as a result of the study of these cases, that when such conditions complicate a renal anomaly the patient is not fit for tropical duty. Patients who require nephrectomy and the majority of those who need plastic procedure for hydronephrosis should, with rare exceptions, be evacuated to the United States. True renal ectopia, horseshoe kidney, other types of fused renal mass and polycystic disease are considered as contraindications to overseas service.