Since the introduction thirty-four years ago of intravenous urography as a means of visualizing the urinary tract, the limitations imposed by the usual form of the examination have become evident and better methods have been sought (5, 8, 11–13). Until recently the 20 ml dose of contrast medium administered to a dehydrated patient has remained the accepted routine for all pyelographic examinations. In an effort to improve the quality of the examination, prolong the nephrogram, and consistently visualize the entire ureter by increasing the radiographic density of the opacified urine, Schencker in 1964 introduced drip infusion urography. This led to a re-evaluation of the low-dosage dehydration method (3,4, 7, 9). Although higher doses of contrast medium do not seem to increase the hazard to the patient, because of the risk and expense smaller doses would be desirable if comparable results could be achieved. Also, the routine use of drip infusion pyelography is precluded by the cost of a disposable infusion set, the time required for its assembly and use, and the duration of the examination which often requires prolonged occupancy of an x-ray room. With these practical shortcomings borne in mind, a new method has been developed, which seems to simplify the drip infusion technic and offer comparable results. Method The patients are well hydrated and the bowel is routinely cleansed prior to the examination. Following a preliminary film, the patient receives a rapid injection of a combination of 50 cc meglumine diatrizoate2 or 40 cc sodium iothalamate3 (containing 20 g iodine), 37.5 cc mannitol, and 0.1 cc vasopressin. A No. 18 needle and a 100 cc syringe are used. Films are obtained at three, five, and seven minutes with ureteric compression or with the patient in 10° of the Trendelenburg position (2). A ten-minute film is obtained after the release of compression or the return of the patient to the horizontal position. If necessary, a fifteen-minute film may be obtained. Results So far, 58 patients have been studied by this new technic. All were referred to the X-ray Department for “infusion pyelography” because prior examinations we “unsatisfactory” or a high blood urea nitrogen was noted. Satisfactory visualization was obtained in all but one patient whose blood urea nitrogen was 120. Figures 1–3 are representative of our results. In all cases the examination was complete at fifteen minutes, and in most instances it could be terminated at the end of ten minutes with visualization of the entire urinary tract. No morbidity or mortality was encountered. The blood pressure of all patients was unaffected by the small dose of vasopressin (14, 15). Discussion The place of high-dose intravenous pyelography has been established.